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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/stdlib-1.18.3.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>STDLIB</strong><br><strong>Reference Manual</strong><br><small>Version 1.18.3</small></p>
<br><a href="javascript:openAllFlips()">Expand All</a><br><a href="javascript:closeAllFlips()">Contract All</a><p><small><strong>Table of Contents</strong></small></p>
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<li title="STDLIB (App)"><a href="STDLIB_app.html">STDLIB (App)
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<li id="no" title="array " expanded="false">array<ul>
<li><a href="array.html">
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<li title="default-1"><a href="array.html#default-1">default/1</a></li>
<li title="fix-1"><a href="array.html#fix-1">fix/1</a></li>
<li title="foldl-3"><a href="array.html#foldl-3">foldl/3</a></li>
<li title="foldr-3"><a href="array.html#foldr-3">foldr/3</a></li>
<li title="from_list-1"><a href="array.html#from_list-1">from_list/1</a></li>
<li title="from_list-2"><a href="array.html#from_list-2">from_list/2</a></li>
<li title="from_orddict-1"><a href="array.html#from_orddict-1">from_orddict/1</a></li>
<li title="from_orddict-2"><a href="array.html#from_orddict-2">from_orddict/2</a></li>
<li title="get-2"><a href="array.html#get-2">get/2</a></li>
<li title="is_array-1"><a href="array.html#is_array-1">is_array/1</a></li>
<li title="is_fix-1"><a href="array.html#is_fix-1">is_fix/1</a></li>
<li title="map-2"><a href="array.html#map-2">map/2</a></li>
<li title="new-0"><a href="array.html#new-0">new/0</a></li>
<li title="new-1"><a href="array.html#new-1">new/1</a></li>
<li title="new-2"><a href="array.html#new-2">new/2</a></li>
<li title="relax-1"><a href="array.html#relax-1">relax/1</a></li>
<li title="reset-2"><a href="array.html#reset-2">reset/2</a></li>
<li title="resize-1"><a href="array.html#resize-1">resize/1</a></li>
<li title="resize-2"><a href="array.html#resize-2">resize/2</a></li>
<li title="set-3"><a href="array.html#set-3">set/3</a></li>
<li title="size-1"><a href="array.html#size-1">size/1</a></li>
<li title="sparse_foldl-3"><a href="array.html#sparse_foldl-3">sparse_foldl/3</a></li>
<li title="sparse_foldr-3"><a href="array.html#sparse_foldr-3">sparse_foldr/3</a></li>
<li title="sparse_map-2"><a href="array.html#sparse_map-2">sparse_map/2</a></li>
<li title="sparse_size-1"><a href="array.html#sparse_size-1">sparse_size/1</a></li>
<li title="sparse_to_list-1"><a href="array.html#sparse_to_list-1">sparse_to_list/1</a></li>
<li title="sparse_to_orddict-1"><a href="array.html#sparse_to_orddict-1">sparse_to_orddict/1</a></li>
<li title="to_list-1"><a href="array.html#to_list-1">to_list/1</a></li>
<li title="to_orddict-1"><a href="array.html#to_orddict-1">to_orddict/1</a></li>
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<li title="encode-1"><a href="base64.html#encode-1">encode/1</a></li>
<li title="encode_to_string-1"><a href="base64.html#encode_to_string-1">encode_to_string/1</a></li>
<li title="decode-1"><a href="base64.html#decode-1">decode/1</a></li>
<li title="decode_to_string-1"><a href="base64.html#decode_to_string-1">decode_to_string/1</a></li>
<li title="mime_decode-1"><a href="base64.html#mime_decode-1">mime_decode/1</a></li>
<li title="mime_decode_to_string-1"><a href="base64.html#mime_decode_to_string-1">mime_decode_to_string/1</a></li>
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<li id="no" title="beam_lib " expanded="false">beam_lib<ul>
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<li title="chunks-2"><a href="beam_lib.html#chunks-2">chunks/2</a></li>
<li title="chunks-3"><a href="beam_lib.html#chunks-3">chunks/3</a></li>
<li title="version-1"><a href="beam_lib.html#version-1">version/1</a></li>
<li title="md5-1"><a href="beam_lib.html#md5-1">md5/1</a></li>
<li title="info-1"><a href="beam_lib.html#info-1">info/1</a></li>
<li title="cmp-2"><a href="beam_lib.html#cmp-2">cmp/2</a></li>
<li title="cmp_dirs-2"><a href="beam_lib.html#cmp_dirs-2">cmp_dirs/2</a></li>
<li title="diff_dirs-2"><a href="beam_lib.html#diff_dirs-2">diff_dirs/2</a></li>
<li title="strip-1"><a href="beam_lib.html#strip-1">strip/1</a></li>
<li title="strip_files-1"><a href="beam_lib.html#strip_files-1">strip_files/1</a></li>
<li title="strip_release-1"><a href="beam_lib.html#strip_release-1">strip_release/1</a></li>
<li title="format_error-1"><a href="beam_lib.html#format_error-1">format_error/1</a></li>
<li title="crypto_key_fun-1"><a href="beam_lib.html#crypto_key_fun-1">crypto_key_fun/1</a></li>
<li title="clear_crypto_key_fun-0"><a href="beam_lib.html#clear_crypto_key_fun-0">clear_crypto_key_fun/0</a></li>
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<li title="bin_to_list-2"><a href="binary.html#bin_to_list-2">bin_to_list/2</a></li>
<li title="bin_to_list-3"><a href="binary.html#bin_to_list-3">bin_to_list/3</a></li>
<li title="compile_pattern-1"><a href="binary.html#compile_pattern-1">compile_pattern/1</a></li>
<li title="copy-1"><a href="binary.html#copy-1">copy/1</a></li>
<li title="copy-2"><a href="binary.html#copy-2">copy/2</a></li>
<li title="decode_unsigned-1"><a href="binary.html#decode_unsigned-1">decode_unsigned/1</a></li>
<li title="decode_unsigned-2"><a href="binary.html#decode_unsigned-2">decode_unsigned/2</a></li>
<li title="encode_unsigned-1"><a href="binary.html#encode_unsigned-1">encode_unsigned/1</a></li>
<li title="encode_unsigned-2"><a href="binary.html#encode_unsigned-2">encode_unsigned/2</a></li>
<li title="first-1"><a href="binary.html#first-1">first/1</a></li>
<li title="last-1"><a href="binary.html#last-1">last/1</a></li>
<li title="list_to_bin-1"><a href="binary.html#list_to_bin-1">list_to_bin/1</a></li>
<li title="longest_common_prefix-1"><a href="binary.html#longest_common_prefix-1">longest_common_prefix/1</a></li>
<li title="longest_common_suffix-1"><a href="binary.html#longest_common_suffix-1">longest_common_suffix/1</a></li>
<li title="match-2"><a href="binary.html#match-2">match/2</a></li>
<li title="match-3"><a href="binary.html#match-3">match/3</a></li>
<li title="matches-2"><a href="binary.html#matches-2">matches/2</a></li>
<li title="matches-3"><a href="binary.html#matches-3">matches/3</a></li>
<li title="part-2"><a href="binary.html#part-2">part/2</a></li>
<li title="part-3"><a href="binary.html#part-3">part/3</a></li>
<li title="referenced_byte_size-1"><a href="binary.html#referenced_byte_size-1">referenced_byte_size/1</a></li>
<li title="replace-3"><a href="binary.html#replace-3">replace/3</a></li>
<li title="replace-4"><a href="binary.html#replace-4">replace/4</a></li>
<li title="split-2"><a href="binary.html#split-2">split/2</a></li>
<li title="split-3"><a href="binary.html#split-3">split/3</a></li>
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<li id="no" title="c " expanded="false">c<ul>
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<li title="bt-1"><a href="c.html#bt-1">bt/1</a></li>
<li title="c-1"><a href="c.html#c-1">c/1</a></li>
<li title="c-2"><a href="c.html#c-2">c/2</a></li>
<li title="cd-1"><a href="c.html#cd-1">cd/1</a></li>
<li title="flush-0"><a href="c.html#flush-0">flush/0</a></li>
<li title="help-0"><a href="c.html#help-0">help/0</a></li>
<li title="i-0"><a href="c.html#i-0">i/0</a></li>
<li title="ni-0"><a href="c.html#ni-0">ni/0</a></li>
<li title="i-3"><a href="c.html#i-3">i/3</a></li>
<li title="l-1"><a href="c.html#l-1">l/1</a></li>
<li title="lc-1"><a href="c.html#lc-1">lc/1</a></li>
<li title="ls-0"><a href="c.html#ls-0">ls/0</a></li>
<li title="ls-1"><a href="c.html#ls-1">ls/1</a></li>
<li title="m-0"><a href="c.html#m-0">m/0</a></li>
<li title="m-1"><a href="c.html#m-1">m/1</a></li>
<li title="memory-0"><a href="c.html#memory-0">memory/0</a></li>
<li title="memory-1"><a href="c.html#memory-1">memory/1</a></li>
<li title="nc-1"><a href="c.html#nc-1">nc/1</a></li>
<li title="nc-2"><a href="c.html#nc-2">nc/2</a></li>
<li title="nl-1"><a href="c.html#nl-1">nl/1</a></li>
<li title="pid-3"><a href="c.html#pid-3">pid/3</a></li>
<li title="pwd-0"><a href="c.html#pwd-0">pwd/0</a></li>
<li title="q-0"><a href="c.html#q-0">q/0</a></li>
<li title="regs-0"><a href="c.html#regs-0">regs/0</a></li>
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<li title="xm-1"><a href="c.html#xm-1">xm/1</a></li>
<li title="y-1"><a href="c.html#y-1">y/1</a></li>
<li title="y-2"><a href="c.html#y-2">y/2</a></li>
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<li title="date_to_gregorian_days-1"><a href="calendar.html#date_to_gregorian_days-1">date_to_gregorian_days/1</a></li>
<li title="date_to_gregorian_days-3"><a href="calendar.html#date_to_gregorian_days-3">date_to_gregorian_days/3</a></li>
<li title="datetime_to_gregorian_seconds-1"><a href="calendar.html#datetime_to_gregorian_seconds-1">datetime_to_gregorian_seconds/1</a></li>
<li title="day_of_the_week-1"><a href="calendar.html#day_of_the_week-1">day_of_the_week/1</a></li>
<li title="day_of_the_week-3"><a href="calendar.html#day_of_the_week-3">day_of_the_week/3</a></li>
<li title="gregorian_days_to_date-1"><a href="calendar.html#gregorian_days_to_date-1">gregorian_days_to_date/1</a></li>
<li title="gregorian_seconds_to_datetime-1"><a href="calendar.html#gregorian_seconds_to_datetime-1">gregorian_seconds_to_datetime/1</a></li>
<li title="is_leap_year-1"><a href="calendar.html#is_leap_year-1">is_leap_year/1</a></li>
<li title="iso_week_number-0"><a href="calendar.html#iso_week_number-0">iso_week_number/0</a></li>
<li title="iso_week_number-1"><a href="calendar.html#iso_week_number-1">iso_week_number/1</a></li>
<li title="last_day_of_the_month-2"><a href="calendar.html#last_day_of_the_month-2">last_day_of_the_month/2</a></li>
<li title="local_time-0"><a href="calendar.html#local_time-0">local_time/0</a></li>
<li title="local_time_to_universal_time-1"><a href="calendar.html#local_time_to_universal_time-1">local_time_to_universal_time/1</a></li>
<li title="local_time_to_universal_time_dst-1"><a href="calendar.html#local_time_to_universal_time_dst-1">local_time_to_universal_time_dst/1</a></li>
<li title="now_to_local_time-1"><a href="calendar.html#now_to_local_time-1">now_to_local_time/1</a></li>
<li title="now_to_universal_time-1"><a href="calendar.html#now_to_universal_time-1">now_to_universal_time/1</a></li>
<li title="now_to_datetime-1"><a href="calendar.html#now_to_datetime-1">now_to_datetime/1</a></li>
<li title="seconds_to_daystime-1"><a href="calendar.html#seconds_to_daystime-1">seconds_to_daystime/1</a></li>
<li title="seconds_to_time-1"><a href="calendar.html#seconds_to_time-1">seconds_to_time/1</a></li>
<li title="time_difference-2"><a href="calendar.html#time_difference-2">time_difference/2</a></li>
<li title="time_to_seconds-1"><a href="calendar.html#time_to_seconds-1">time_to_seconds/1</a></li>
<li title="universal_time-0"><a href="calendar.html#universal_time-0">universal_time/0</a></li>
<li title="universal_time_to_local_time-1"><a href="calendar.html#universal_time_to_local_time-1">universal_time_to_local_time/1</a></li>
<li title="valid_date-1"><a href="calendar.html#valid_date-1">valid_date/1</a></li>
<li title="valid_date-3"><a href="calendar.html#valid_date-3">valid_date/3</a></li>
</ul>
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<li id="no" title="dets " expanded="false">dets<ul>
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<li title="all-0"><a href="dets.html#all-0">all/0</a></li>
<li title="bchunk-2"><a href="dets.html#bchunk-2">bchunk/2</a></li>
<li title="close-1"><a href="dets.html#close-1">close/1</a></li>
<li title="delete-2"><a href="dets.html#delete-2">delete/2</a></li>
<li title="delete_all_objects-1"><a href="dets.html#delete_all_objects-1">delete_all_objects/1</a></li>
<li title="delete_object-2"><a href="dets.html#delete_object-2">delete_object/2</a></li>
<li title="first-1"><a href="dets.html#first-1">first/1</a></li>
<li title="foldl-3"><a href="dets.html#foldl-3">foldl/3</a></li>
<li title="foldr-3"><a href="dets.html#foldr-3">foldr/3</a></li>
<li title="from_ets-2"><a href="dets.html#from_ets-2">from_ets/2</a></li>
<li title="info-1"><a href="dets.html#info-1">info/1</a></li>
<li title="info-2"><a href="dets.html#info-2">info/2</a></li>
<li title="init_table-2"><a href="dets.html#init_table-2">init_table/2</a></li>
<li title="init_table-3"><a href="dets.html#init_table-3">init_table/3</a></li>
<li title="insert-2"><a href="dets.html#insert-2">insert/2</a></li>
<li title="insert_new-2"><a href="dets.html#insert_new-2">insert_new/2</a></li>
<li title="is_compatible_bchunk_format-2"><a href="dets.html#is_compatible_bchunk_format-2">is_compatible_bchunk_format/2</a></li>
<li title="is_dets_file-1"><a href="dets.html#is_dets_file-1">is_dets_file/1</a></li>
<li title="lookup-2"><a href="dets.html#lookup-2">lookup/2</a></li>
<li title="match-1"><a href="dets.html#match-1">match/1</a></li>
<li title="match-2"><a href="dets.html#match-2">match/2</a></li>
<li title="match-3"><a href="dets.html#match-3">match/3</a></li>
<li title="match_delete-2"><a href="dets.html#match_delete-2">match_delete/2</a></li>
<li title="match_object-1"><a href="dets.html#match_object-1">match_object/1</a></li>
<li title="match_object-2"><a href="dets.html#match_object-2">match_object/2</a></li>
<li title="match_object-3"><a href="dets.html#match_object-3">match_object/3</a></li>
<li title="member-2"><a href="dets.html#member-2">member/2</a></li>
<li title="next-2"><a href="dets.html#next-2">next/2</a></li>
<li title="open_file-1"><a href="dets.html#open_file-1">open_file/1</a></li>
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<li title="pid2name-1"><a href="dets.html#pid2name-1">pid2name/1</a></li>
<li title="repair_continuation-2"><a href="dets.html#repair_continuation-2">repair_continuation/2</a></li>
<li title="safe_fixtable-2"><a href="dets.html#safe_fixtable-2">safe_fixtable/2</a></li>
<li title="select-1"><a href="dets.html#select-1">select/1</a></li>
<li title="select-2"><a href="dets.html#select-2">select/2</a></li>
<li title="select-3"><a href="dets.html#select-3">select/3</a></li>
<li title="select_delete-2"><a href="dets.html#select_delete-2">select_delete/2</a></li>
<li title="slot-2"><a href="dets.html#slot-2">slot/2</a></li>
<li title="sync-1"><a href="dets.html#sync-1">sync/1</a></li>
<li title="table-1"><a href="dets.html#table-1">table/1</a></li>
<li title="table-2"><a href="dets.html#table-2">table/2</a></li>
<li title="to_ets-2"><a href="dets.html#to_ets-2">to_ets/2</a></li>
<li title="traverse-2"><a href="dets.html#traverse-2">traverse/2</a></li>
<li title="update_counter-3"><a href="dets.html#update_counter-3">update_counter/3</a></li>
</ul>
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<li id="no" title="dict " expanded="false">dict<ul>
<li><a href="dict.html">
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<li title="append-3"><a href="dict.html#append-3">append/3</a></li>
<li title="append_list-3"><a href="dict.html#append_list-3">append_list/3</a></li>
<li title="erase-2"><a href="dict.html#erase-2">erase/2</a></li>
<li title="fetch-2"><a href="dict.html#fetch-2">fetch/2</a></li>
<li title="fetch_keys-1"><a href="dict.html#fetch_keys-1">fetch_keys/1</a></li>
<li title="filter-2"><a href="dict.html#filter-2">filter/2</a></li>
<li title="find-2"><a href="dict.html#find-2">find/2</a></li>
<li title="fold-3"><a href="dict.html#fold-3">fold/3</a></li>
<li title="from_list-1"><a href="dict.html#from_list-1">from_list/1</a></li>
<li title="is_key-2"><a href="dict.html#is_key-2">is_key/2</a></li>
<li title="map-2"><a href="dict.html#map-2">map/2</a></li>
<li title="merge-3"><a href="dict.html#merge-3">merge/3</a></li>
<li title="new-0"><a href="dict.html#new-0">new/0</a></li>
<li title="size-1"><a href="dict.html#size-1">size/1</a></li>
<li title="store-3"><a href="dict.html#store-3">store/3</a></li>
<li title="to_list-1"><a href="dict.html#to_list-1">to_list/1</a></li>
<li title="update-3"><a href="dict.html#update-3">update/3</a></li>
<li title="update-4"><a href="dict.html#update-4">update/4</a></li>
<li title="update_counter-3"><a href="dict.html#update_counter-3">update_counter/3</a></li>
</ul>
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<li title="add_edge-3"><a href="digraph.html#add_edge-3">add_edge/3</a></li>
<li title="add_edge-4"><a href="digraph.html#add_edge-4">add_edge/4</a></li>
<li title="add_edge-5"><a href="digraph.html#add_edge-5">add_edge/5</a></li>
<li title="add_vertex-1"><a href="digraph.html#add_vertex-1">add_vertex/1</a></li>
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<!-- refpage --><center><h1>lists</h1></center>
<h3>MODULE</h3>
<div class="REFBODY">lists</div>
<h3>MODULE SUMMARY</h3>
<div class="REFBODY">List Processing Functions</div>
<h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
<p>This module contains functions for list processing.</p>
<p>Unless otherwise stated, all functions assume that position
numbering starts at 1. That is, the first element of a list is at
position 1.</p>
<p>Two terms <span class="code">T1</span> and <span class="code">T2</span> compare equal if
<span class="code">T1 == T2</span> evaluates to <span class="code">true</span>. They match
if <span class="code">T1 =:= T2</span> evaluates to <span class="code">true</span>.</p>
<p>Whenever an <a name="ordering_function"></a><strong>ordering function</strong>
<span class="code">F</span> is expected as argument, it is assumed that the
following properties hold of <span class="code">F</span> for all x, y and z:</p>
<ul>
<li>
<p>if x <span class="code">F</span> y and y <span class="code">F</span> x then x = y (<span class="code">F</span>
is antisymmetric);</p>
</li>
<li>
<p>if x <span class="code">F</span> y and y <span class="code">F</span> z then x <span class="code">F</span> z
(<span class="code">F</span> is transitive);</p>
</li>
<li>
<p>x <span class="code">F</span> y or y <span class="code">F</span> x (<span class="code">F</span> is total).</p>
</li>
</ul>
<p>An example of a typical ordering function is less than or equal
to, <span class="code">=</2</span>.</p>
</p></div>
<h3>EXPORTS</h3>
<p><a name="all-2"></a><span class="bold_code">all(Pred, List) -> boolean()</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Pred = fun((Elem :: T) -> boolean())</span></div>
<div class="REFTYPES"><span class="bold_code">List = [T]</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns <span class="code">true</span> if <span class="code">Pred(Elem)</span> returns
<span class="code">true</span> for all elements <span class="code">Elem</span> in <span class="code">List</span>,
otherwise <span class="code">false</span>.</p>
</p></div>
<p><a name="any-2"></a><span class="bold_code">any(Pred, List) -> boolean()</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Pred = fun((Elem :: T) -> boolean())</span></div>
<div class="REFTYPES"><span class="bold_code">List = [T]</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns <span class="code">true</span> if <span class="code">Pred(Elem)</span> returns
<span class="code">true</span> for at least one element <span class="code">Elem</span> in
<span class="code">List</span>.</p>
</p></div>
<p><a name="append-1"></a><span class="bold_code">append(ListOfLists) -> List1</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">ListOfLists = [List]</span></div>
<div class="REFTYPES"><span class="bold_code">List = List1 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list in which all the sub-lists of
<span class="code">ListOfLists</span> have been appended. For example:</p>
<div class="example"><pre>
> <span class="bold_code">lists:append([[1, 2, 3], [a, b], [4, 5, 6]]).</span>
[1,2,3,a,b,4,5,6]</pre></div>
</p></div>
<p><a name="append-2"></a><span class="bold_code">append(List1, List2) -> List3</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = List3 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a new list <span class="code">List3</span> which is made from
the elements of <span class="code">List1</span> followed by the elements of
<span class="code">List2</span>. For example:</p>
<div class="example"><pre>
> <span class="bold_code">lists:append("abc", "def").</span>
"abcdef"</pre></div>
<p><span class="code">lists:append(A, B)</span> is equivalent to <span class="code">A ++ B</span>.</p>
</p></div>
<p><a name="concat-1"></a><span class="bold_code">concat(Things) -> string()</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Things = [Thing]</span></div>
<div class="REFTYPES"><span class="bold_code">Thing = atom() | integer() | float() | string()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Concatenates the text representation of the elements
of <span class="code">Things</span>. The elements of <span class="code">Things</span> can be atoms,
integers, floats or strings.</p>
<div class="example"><pre>
> <span class="bold_code">lists:concat([doc, '/', file, '.', 3]).</span>
"doc/file.3"</pre></div>
</p></div>
<p><a name="delete-2"></a><span class="bold_code">delete(Elem, List1) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Elem = T</span></div>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a copy of <span class="code">List1</span> where the first element
matching <span class="code">Elem</span> is deleted, if there is such an
element.</p>
</p></div>
<p><a name="dropwhile-2"></a><span class="bold_code">dropwhile(Pred, List1) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Pred = fun((Elem :: T) -> boolean())</span></div>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Drops elements <span class="code">Elem</span> from <span class="code">List1</span> while
<span class="code">Pred(Elem)</span> returns <span class="code">true</span> and returns
the remaining list.</p>
</p></div>
<p><a name="duplicate-2"></a><span class="bold_code">duplicate(N, Elem) -> List</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 0</span></div>
<div class="REFTYPES"><span class="bold_code">Elem = T</span></div>
<div class="REFTYPES"><span class="bold_code">List = [T]</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list which contains <span class="code">N</span> copies of the term
<span class="code">Elem</span>. For example:</p>
<div class="example"><pre>
> <span class="bold_code">lists:duplicate(5, xx).</span>
[xx,xx,xx,xx,xx]</pre></div>
</p></div>
<p><a name="filter-2"></a><span class="bold_code">filter(Pred, List1) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Pred = fun((Elem :: T) -> boolean())</span></div>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p><span class="code">List2</span> is a list of all elements <span class="code">Elem</span> in
<span class="code">List1</span> for which <span class="code">Pred(Elem)</span> returns
<span class="code">true</span>.</p>
</p></div>
<p><a name="flatlength-1"></a><span class="bold_code">flatlength(DeepList) -> integer() >= 0</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">DeepList = [term() | DeepList]</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Equivalent to <span class="code">length(flatten(DeepList))</span>, but more
efficient.</p>
</p></div>
<p><a name="flatmap-2"></a><span class="bold_code">flatmap(Fun, List1) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Fun = fun((A) -> [B])</span></div>
<div class="REFTYPES"><span class="bold_code">List1 = [A]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [B]</span></div>
<div class="REFTYPES"><span class="bold_code">A = B = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Takes a function from <span class="code">A</span>s to lists of <span class="code">B</span>s, and a
list of <span class="code">A</span>s (<span class="code">List1</span>) and produces a list of
<span class="code">B</span>s by applying the function to every element in
<span class="code">List1</span> and appending the resulting lists.</p>
<p>That is, <span class="code">flatmap</span> behaves as if it had been defined as
follows:</p>
<div class="example"><pre>
flatmap(Fun, List1) ->
append(map(Fun, List1)).</pre></div>
<p>Example:</p>
<div class="example"><pre>
> <span class="bold_code">lists:flatmap(fun(X)->[X,X] end, [a,b,c]).</span>
[a,a,b,b,c,c]</pre></div>
</p></div>
<p><a name="flatten-1"></a><span class="bold_code">flatten(DeepList) -> List</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">DeepList = [term() | DeepList]</span></div>
<div class="REFTYPES"><span class="bold_code">List = [term()]</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a flattened version of <span class="code">DeepList</span>.</p>
</p></div>
<p><a name="flatten-2"></a><span class="bold_code">flatten(DeepList, Tail) -> List</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">DeepList = [term() | DeepList]</span></div>
<div class="REFTYPES"><span class="bold_code">Tail = List = [term()]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a flattened version of <span class="code">DeepList</span> with the tail
<span class="code">Tail</span> appended.</p>
</p></div>
<p><a name="foldl-3"></a><span class="bold_code">foldl(Fun, Acc0, List) -> Acc1</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Fun = fun((Elem :: T, AccIn) -> AccOut)</span></div>
<div class="REFTYPES"><span class="bold_code">Acc0 = Acc1 = AccIn = AccOut = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">List = [T]</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Calls <span class="code">Fun(Elem, AccIn)</span> on successive elements <span class="code">A</span>
of <span class="code">List</span>, starting with <span class="code">AccIn == Acc0</span>.
<span class="code">Fun/2</span> must return a new accumulator which is passed to
the next call. The function returns the final value of
the accumulator. <span class="code">Acc0</span> is returned if the list is empty.
For example:</p>
<div class="example"><pre>
> <span class="bold_code">lists:foldl(fun(X, Sum) -> X + Sum end, 0, [1,2,3,4,5]).</span>
15
> <span class="bold_code">lists:foldl(fun(X, Prod) -> X * Prod end, 1, [1,2,3,4,5]).</span>
120</pre></div>
</p></div>
<p><a name="foldr-3"></a><span class="bold_code">foldr(Fun, Acc0, List) -> Acc1</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Fun = fun((Elem :: T, AccIn) -> AccOut)</span></div>
<div class="REFTYPES"><span class="bold_code">Acc0 = Acc1 = AccIn = AccOut = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">List = [T]</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Like <span class="code">foldl/3</span>, but the list is traversed from right to
left. For example:</p>
<div class="example"><pre>
> <span class="bold_code">P = fun(A, AccIn) -> io:format("~p ", [A]), AccIn end.</span>
#Fun<erl_eval.12.2225172>
> <span class="bold_code">lists:foldl(P, void, [1,2,3]).</span>
1 2 3 void
> <span class="bold_code">lists:foldr(P, void, [1,2,3]).</span>
3 2 1 void</pre></div>
<p><span class="code">foldl/3</span> is tail recursive and would usually be
preferred to <span class="code">foldr/3</span>.</p>
</p></div>
<p><a name="foreach-2"></a><span class="bold_code">foreach(Fun, List) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Fun = fun((Elem :: T) -> term())</span></div>
<div class="REFTYPES"><span class="bold_code">List = [T]</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Calls <span class="code">Fun(Elem)</span> for each element <span class="code">Elem</span> in
<span class="code">List</span>. This function is used for its side effects and
the evaluation order is defined to be the same as the order
of the elements in the list.</p>
</p></div>
<p><a name="keydelete-3"></a><span class="bold_code">keydelete(Key, N, TupleList1) -> TupleList2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Key = term()</span></div>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 1</span></div>
<div class="REFBODY">1..tuple_size(Tuple)</div>
<div class="REFTYPES"><span class="bold_code">TupleList1 = TupleList2 = [Tuple]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Tuple = tuple()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a copy of <span class="code">TupleList1</span> where the first
occurrence of a tuple whose <span class="code">N</span>th element compares equal to
<span class="code">Key</span> is deleted, if there is such a tuple.</p>
</p></div>
<p><a name="keyfind-3"><span class="bold_code">keyfind(Key, N, TupleList) -> Tuple | false</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Key = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">N = 1..tuple_size(Tuple)</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">TupleList = [Tuple]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Tuple = tuple()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Searches the list of tuples <span class="code">TupleList</span> for a
tuple whose <span class="code">N</span>th element compares equal to <span class="code">Key</span>.
Returns <span class="code">Tuple</span> if such a tuple is found,
otherwise <span class="code">false</span>.</p>
</p></div>
<p><a name="keymap-3"></a><span class="bold_code">keymap(Fun, N, TupleList1) -> TupleList2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Fun = fun((Term1 :: term()) -> Term2 :: term())</span></div>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 1</span></div>
<div class="REFBODY">1..tuple_size(Tuple)</div>
<div class="REFTYPES"><span class="bold_code">TupleList1 = TupleList2 = [Tuple]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Tuple = tuple()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list of tuples where, for each tuple in
<span class="code">TupleList1</span>, the <span class="code">N</span>th element <span class="code">Term1</span> of the tuple
has been replaced with the result of calling
<span class="code">Fun(Term1)</span>.</p>
<p>Examples:</p>
<div class="example"><pre>
> <span class="bold_code">Fun = fun(Atom) -> atom_to_list(Atom) end.</span>
#Fun<erl_eval.6.10732646>
2> <span class="bold_code">lists:keymap(Fun, 2, [{name,jane,22},{name,lizzie,20},{name,lydia,15}]).</span>
[{name,"jane",22},{name,"lizzie",20},{name,"lydia",15}]</pre></div>
</p></div>
<p><a name="keymember-3"><span class="bold_code">keymember(Key, N, TupleList) -> boolean()</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Key = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">N = 1..tuple_size(Tuple)</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">TupleList = [Tuple]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code"> Tuple = tuple()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Returns <span class="code">true</span> if there is a tuple in <span class="code">TupleList</span>
whose <span class="code">N</span>th element compares equal to <span class="code">Key</span>, otherwise
<span class="code">false</span>.</p>
</p></div>
<p><a name="keymerge-3"></a><span class="bold_code">keymerge(N, TupleList1, TupleList2) -> TupleList3</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 1</span></div>
<div class="REFBODY">1..tuple_size(Tuple)</div>
<div class="REFTYPES"><span class="bold_code">TupleList1 = [T1]</span></div>
<div class="REFTYPES"><span class="bold_code">TupleList2 = [T2]</span></div>
<div class="REFTYPES"><span class="bold_code">TupleList3 = [(T1 | T2)]</span></div>
<div class="REFTYPES"><span class="bold_code">T1 = T2 = Tuple</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Tuple = tuple()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sorted list formed by merging <span class="code">TupleList1</span>
and <span class="code">TupleList2</span>. The merge is performed on
the <span class="code">N</span>th element of each tuple. Both <span class="code">TupleList1</span> and
<span class="code">TupleList2</span> must be key-sorted prior to evaluating this
function. When two tuples compare equal, the tuple from
<span class="code">TupleList1</span> is picked before the tuple from
<span class="code">TupleList2</span>.</p>
</p></div>
<p><a name="keyreplace-4"></a><span class="bold_code">keyreplace(Key, N, TupleList1, NewTuple) -> TupleList2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Key = term()</span></div>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 1</span></div>
<div class="REFBODY">1..tuple_size(Tuple)</div>
<div class="REFTYPES"><span class="bold_code">TupleList1 = TupleList2 = [Tuple]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">NewTuple = Tuple</span></div>
<div class="REFTYPES"><span class="bold_code">Tuple = tuple()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a copy of <span class="code">TupleList1</span> where the first
occurrence of a <span class="code">T</span> tuple whose <span class="code">N</span>th element
compares equal to <span class="code">Key</span> is replaced with
<span class="code">NewTuple</span>, if there is such a tuple <span class="code">T</span>.</p>
</p></div>
<p><a name="keysearch-3"><span class="bold_code">keysearch(Key, N, TupleList) -> {value, Tuple} | false</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Key = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">N = 1..tuple_size(Tuple)</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">TupleList = [Tuple]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Tuple = tuple()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Searches the list of tuples <span class="code">TupleList</span> for a
tuple whose <span class="code">N</span>th element compares equal to <span class="code">Key</span>.
Returns <span class="code">{value, Tuple}</span> if such a tuple is found,
otherwise <span class="code">false</span>.</p>
<div class="note">
<div class="label">Note</div>
<div class="content"><p><p>This function is retained for backward compatibility.
The function <span class="code">lists:keyfind/3</span> (introduced in R13A)
is in most cases more convenient.</p></p></div>
</div>
</p></div>
<p><a name="keysort-2"></a><span class="bold_code">keysort(N, TupleList1) -> TupleList2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 1</span></div>
<div class="REFBODY">1..tuple_size(Tuple)</div>
<div class="REFTYPES"><span class="bold_code">TupleList1 = TupleList2 = [Tuple]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Tuple = tuple()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list containing the sorted elements of the list
<span class="code">TupleList1</span>. Sorting is performed on the <span class="code">N</span>th
element of the tuples. The sort is stable.</p>
</p></div>
<p><a name="keystore-4"></a><span class="bold_code">keystore(Key, N, TupleList1, NewTuple) -> TupleList2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Key = term()</span></div>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 1</span></div>
<div class="REFBODY">1..tuple_size(Tuple)</div>
<div class="REFTYPES"><span class="bold_code">TupleList1 = [Tuple]</span></div>
<div class="REFTYPES"><span class="bold_code">TupleList2 = [Tuple, ...]</span></div>
<div class="REFTYPES"><span class="bold_code">NewTuple = Tuple</span></div>
<div class="REFTYPES"><span class="bold_code">Tuple = tuple()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a copy of <span class="code">TupleList1</span> where the first
occurrence of a tuple <span class="code">T</span> whose <span class="code">N</span>th element
compares equal to <span class="code">Key</span> is replaced with
<span class="code">NewTuple</span>, if there is such a tuple <span class="code">T</span>. If there
is no such tuple <span class="code">T</span> a copy of <span class="code">TupleList1</span> where
[<span class="code">NewTuple</span>] has been appended to the end is
returned.</p>
</p></div>
<p><a name="keytake-3"></a><span class="bold_code">keytake(Key, N, TupleList1) -> {value, Tuple, TupleList2} | false</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Key = term()</span></div>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 1</span></div>
<div class="REFBODY">1..tuple_size(Tuple)</div>
<div class="REFTYPES"><span class="bold_code">TupleList1 = TupleList2 = [tuple()]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Tuple = tuple()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Searches the list of tuples <span class="code">TupleList1</span> for a tuple
whose <span class="code">N</span>th element compares equal to <span class="code">Key</span>.
Returns <span class="code">{value, Tuple, TupleList2}</span> if such a tuple is
found, otherwise <span class="code">false</span>. <span class="code">TupleList2</span> is a copy
of <span class="code">TupleList1</span> where the first occurrence of
<span class="code">Tuple</span> has been removed.</p>
</p></div>
<p><a name="last-1"></a><span class="bold_code">last(List) -> Last</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List = [T, ...]</span></div>
<div class="REFTYPES"><span class="bold_code">Last = T</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the last element in <span class="code">List</span>.</p>
</p></div>
<p><a name="map-2"></a><span class="bold_code">map(Fun, List1) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Fun = fun((A) -> B)</span></div>
<div class="REFTYPES"><span class="bold_code">List1 = [A]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [B]</span></div>
<div class="REFTYPES"><span class="bold_code">A = B = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Takes a function from <span class="code">A</span>s to <span class="code">B</span>s, and a list of
<span class="code">A</span>s and produces a list of <span class="code">B</span>s by applying
the function to every element in the list. This function is
used to obtain the return values. The evaluation order is
implementation dependent.</p>
</p></div>
<p><a name="mapfoldl-3"></a><span class="bold_code">mapfoldl(Fun, Acc0, List1) -> {List2, Acc1}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Fun = fun((A, AccIn) -> {B, AccOut})</span></div>
<div class="REFTYPES"><span class="bold_code">Acc0 = Acc1 = AccIn = AccOut = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">List1 = [A]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [B]</span></div>
<div class="REFTYPES"><span class="bold_code">A = B = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p><span class="code">mapfoldl</span> combines the operations of <span class="code">map/2</span> and
<span class="code">foldl/3</span> into one pass. An example, summing
the elements in a list and double them at the same time:</p>
<div class="example"><pre>
> <span class="bold_code">lists:mapfoldl(fun(X, Sum) -> {2*X, X+Sum} end,</span>
<span class="bold_code">0, [1,2,3,4,5]).</span>
{[2,4,6,8,10],15}</pre></div>
</p></div>
<p><a name="mapfoldr-3"></a><span class="bold_code">mapfoldr(Fun, Acc0, List1) -> {List2, Acc1}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Fun = fun((A, AccIn) -> {B, AccOut})</span></div>
<div class="REFTYPES"><span class="bold_code">Acc0 = Acc1 = AccIn = AccOut = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">List1 = [A]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [B]</span></div>
<div class="REFTYPES"><span class="bold_code">A = B = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p><span class="code">mapfoldr</span> combines the operations of <span class="code">map/2</span> and
<span class="code">foldr/3</span> into one pass.</p>
</p></div>
<p><a name="max-1"></a><span class="bold_code">max(List) -> Max</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List = [T, ...]</span></div>
<div class="REFTYPES"><span class="bold_code">Max = T</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the first element of <span class="code">List</span> that compares
greater than or equal to all other elements of
<span class="code">List</span>.</p>
</p></div>
<p><a name="member-2"><span class="bold_code">member(Elem, List) -> boolean()</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Elem = term()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">List = [term()]</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Returns <span class="code">true</span> if <span class="code">Elem</span> matches some element of
<span class="code">List</span>, otherwise <span class="code">false</span>.</p>
</p></div>
<p><a name="merge-1"></a><span class="bold_code">merge(ListOfLists) -> List1</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">ListOfLists = [List]</span></div>
<div class="REFTYPES"><span class="bold_code">List = List1 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sorted list formed by merging all the sub-lists
of <span class="code">ListOfLists</span>. All sub-lists must be sorted prior to
evaluating this function. When two elements compare equal,
the element from the sub-list with the lowest position in
<span class="code">ListOfLists</span> is picked before the other element.</p>
</p></div>
<p><a name="merge-2"></a><span class="bold_code">merge(List1, List2) -> List3</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = [X]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [Y]</span></div>
<div class="REFTYPES"><span class="bold_code">List3 = [(X | Y)]</span></div>
<div class="REFTYPES"><span class="bold_code">X = Y = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sorted list formed by merging <span class="code">List1</span> and
<span class="code">List2</span>. Both <span class="code">List1</span> and <span class="code">List2</span> must be
sorted prior to evaluating this function. When two elements
compare equal, the element from <span class="code">List1</span> is picked
before the element from <span class="code">List2</span>.</p>
</p></div>
<p><a name="merge-3"></a><span class="bold_code">merge(Fun, List1, List2) -> List3</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Fun = fun((A, B) -> boolean())</span></div>
<div class="REFTYPES"><span class="bold_code">List1 = [A]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [B]</span></div>
<div class="REFTYPES"><span class="bold_code">List3 = [(A | B)]</span></div>
<div class="REFTYPES"><span class="bold_code">A = B = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sorted list formed by merging <span class="code">List1</span> and
<span class="code">List2</span>. Both <span class="code">List1</span> and <span class="code">List2</span> must be
sorted according to the <span class="bold_code"><a href="#ordering_function">ordering function</a></span>
<span class="code">Fun</span> prior to evaluating this function. <span class="code">Fun(A,
B)</span> should return <span class="code">true</span> if <span class="code">A</span> compares less
than or equal to <span class="code">B</span> in the ordering, <span class="code">false</span>
otherwise. When two elements compare equal, the element from
<span class="code">List1</span> is picked before the element from
<span class="code">List2</span>.</p>
</p></div>
<p><a name="merge3-3"></a><span class="bold_code">merge3(List1, List2, List3) -> List4</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = [X]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [Y]</span></div>
<div class="REFTYPES"><span class="bold_code">List3 = [Z]</span></div>
<div class="REFTYPES"><span class="bold_code">List4 = [(X | Y | Z)]</span></div>
<div class="REFTYPES"><span class="bold_code">X = Y = Z = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sorted list formed by merging <span class="code">List1</span>,
<span class="code">List2</span> and <span class="code">List3</span>. All of <span class="code">List1</span>,
<span class="code">List2</span> and <span class="code">List3</span> must be sorted prior to
evaluating this function. When two elements compare equal,
the element from <span class="code">List1</span>, if there is such an element,
is picked before the other element, otherwise the element
from <span class="code">List2</span> is picked before the element from
<span class="code">List3</span>.</p>
</p></div>
<p><a name="min-1"></a><span class="bold_code">min(List) -> Min</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List = [T, ...]</span></div>
<div class="REFTYPES"><span class="bold_code">Min = T</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the first element of <span class="code">List</span> that compares
less than or equal to all other elements of
<span class="code">List</span>.</p>
</p></div>
<p><a name="nth-2"></a><span class="bold_code">nth(N, List) -> Elem</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 1</span></div>
<div class="REFBODY">1..length(List)</div>
<div class="REFTYPES"><span class="bold_code">List = [T, ...]</span></div>
<div class="REFTYPES"><span class="bold_code">Elem = T</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the <span class="code">N</span>th element of <span class="code">List</span>. For example:</p>
<div class="example"><pre>
> <span class="bold_code">lists:nth(3, [a, b, c, d, e]).</span>
c</pre></div>
</p></div>
<p><a name="nthtail-2"></a><span class="bold_code">nthtail(N, List) -> Tail</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 0</span></div>
<div class="REFBODY">0..length(List)</div>
<div class="REFTYPES"><span class="bold_code">List = [T, ...]</span></div>
<div class="REFTYPES"><span class="bold_code">Tail = [T]</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the <span class="code">N</span>th tail of <span class="code">List</span>, that is, the sublist of
<span class="code">List</span> starting at <span class="code">N+1</span> and continuing up to
the end of the list. For example:</p>
<div class="example"><pre>
> <span class="bold_code">lists:nthtail(3, [a, b, c, d, e]).</span>
[d,e]
> <span class="bold_code">tl(tl(tl([a, b, c, d, e]))).</span>
[d,e]
> <span class="bold_code">lists:nthtail(0, [a, b, c, d, e]).</span>
[a,b,c,d,e]
> <span class="bold_code">lists:nthtail(5, [a, b, c, d, e]).</span>
[]</pre></div>
</p></div>
<p><a name="partition-2"></a><span class="bold_code">partition(Pred, List) -> {Satisfying, NotSatisfying}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Pred = fun((Elem :: T) -> boolean())</span></div>
<div class="REFTYPES"><span class="bold_code">List = Satisfying = NotSatisfying = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Partitions <span class="code">List</span> into two lists, where the first list
contains all elements for which <span class="code">Pred(Elem)</span> returns
<span class="code">true</span>, and the second list contains all elements for
which <span class="code">Pred(Elem)</span> returns <span class="code">false</span>.</p>
<p>Examples:</p>
<div class="example"><pre>
> <span class="bold_code">lists:partition(fun(A) -> A rem 2 == 1 end, [1,2,3,4,5,6,7]).</span>
{[1,3,5,7],[2,4,6]}
> <span class="bold_code">lists:partition(fun(A) -> is_atom(A) end, [a,b,1,c,d,2,3,4,e]).</span>
{[a,b,c,d,e],[1,2,3,4]}</pre></div>
<p>See also <span class="code">splitwith/2</span> for a different way to partition
a list.</p>
</p></div>
<p><a name="prefix-2"></a><span class="bold_code">prefix(List1, List2) -> boolean()</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns <span class="code">true</span> if <span class="code">List1</span> is a prefix of
<span class="code">List2</span>, otherwise <span class="code">false</span>.</p>
</p></div>
<p><a name="reverse-1"></a><span class="bold_code">reverse(List1) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list with the elements in <span class="code">List1</span>
in reverse order.</p>
</p></div>
<p><a name="reverse-2"><span class="bold_code">reverse(List1, Tail) -> List2</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">List1 = Tail = List2 = [term()]</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Returns a list with the elements in <span class="code">List1</span>
in reverse order, with the tail <span class="code">Tail</span> appended. For
example:</p>
<div class="example"><pre>
> <span class="bold_code">lists:reverse([1, 2, 3, 4], [a, b, c]).</span>
[4,3,2,1,a,b,c]</pre></div>
</p></div>
<p><a name="seq-2"></a><span class="bold_code">seq(From, To) -> Seq</span><br><a name="seq-3"></a><span class="bold_code">seq(From, To, Incr) -> Seq</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">From = To = Incr = integer()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Seq = [integer()]</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a sequence of integers which starts with <span class="code">From</span>
and contains the successive results of adding <span class="code">Incr</span> to
the previous element, until <span class="code">To</span> has been reached or
passed (in the latter case, <span class="code">To</span> is not an element of
the sequence). <span class="code">Incr</span> defaults to 1.</p>
<p>Failure: If <span class="code">To<From-Incr</span> and <span class="code">Incr</span>
is positive, or if <span class="code">To>From-Incr</span> and <span class="code">Incr</span> is
negative, or if <span class="code">Incr==0</span> and <span class="code">From/=To</span>.</p>
<p>The following equalities hold for all sequences:</p>
<div class="example"><pre>
length(lists:seq(From, To)) == To-From+1
length(lists:seq(From, To, Incr)) == (To-From+Incr) div Incr</pre></div>
<p>Examples:</p>
<div class="example"><pre>
> <span class="bold_code">lists:seq(1, 10).</span>
[1,2,3,4,5,6,7,8,9,10]
> <span class="bold_code">lists:seq(1, 20, 3).</span>
[1,4,7,10,13,16,19]
> <span class="bold_code">lists:seq(1, 0, 1).</span>
[]
> <span class="bold_code">lists:seq(10, 6, 4).</span>
[]
> <span class="bold_code">lists:seq(1, 1, 0).</span>
[1]</pre></div>
</p></div>
<p><a name="sort-1"></a><span class="bold_code">sort(List1) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list containing the sorted elements of
<span class="code">List1</span>.</p>
</p></div>
<p><a name="sort-2"></a><span class="bold_code">sort(Fun, List1) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Fun = fun((A :: T, B :: T) -> boolean())</span></div>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list containing the sorted elements of
<span class="code">List1</span>, according to the <span class="bold_code"><a href="#ordering_function">ordering function</a></span>
<span class="code">Fun</span>. <span class="code">Fun(A, B)</span> should return <span class="code">true</span> if
<span class="code">A</span> compares less than or equal to <span class="code">B</span> in the
ordering, <span class="code">false</span> otherwise.</p>
</p></div>
<p><a name="split-2"></a><span class="bold_code">split(N, List1) -> {List2, List3}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 0</span></div>
<div class="REFBODY">0..length(List1)</div>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = List3 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Splits <span class="code">List1</span> into <span class="code">List2</span> and <span class="code">List3</span>.
<span class="code">List2</span> contains the first <span class="code">N</span> elements and
<span class="code">List3</span> the rest of the elements (the <span class="code">N</span>th tail).</p>
</p></div>
<p><a name="splitwith-2"></a><span class="bold_code">splitwith(Pred, List) -> {List1, List2}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Pred = fun((T) -> boolean())</span></div>
<div class="REFTYPES"><span class="bold_code">List = List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Partitions <span class="code">List</span> into two lists according to
<span class="code">Pred</span>. <span class="code">splitwith/2</span> behaves as if it is defined
as follows:</p>
<div class="example"><pre>
splitwith(Pred, List) ->
{takewhile(Pred, List), dropwhile(Pred, List)}.</pre></div>
<p>Examples:</p>
<div class="example"><pre>
> <span class="bold_code">lists:splitwith(fun(A) -> A rem 2 == 1 end, [1,2,3,4,5,6,7]).</span>
{[1],[2,3,4,5,6,7]}
> <span class="bold_code">lists:splitwith(fun(A) -> is_atom(A) end, [a,b,1,c,d,2,3,4,e]).</span>
{[a,b],[1,c,d,2,3,4,e]}</pre></div>
<p>See also <span class="code">partition/2</span> for a different way to partition
a list.</p>
</p></div>
<p><a name="sublist-2"></a><span class="bold_code">sublist(List1, Len) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Len = integer() >= 0</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sub-list of <span class="code">List1</span> starting at position 1
and with (max) <span class="code">Len</span> elements. It is not an error for
<span class="code">Len</span> to exceed the length of the list, in that case
the whole list is returned.</p>
</p></div>
<p><a name="sublist-3"></a><span class="bold_code">sublist(List1, Start, Len) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Start = integer() >= 1</span></div>
<div class="REFBODY">1..(length(List1)+1)</div>
<div class="REFTYPES"><span class="bold_code">Len = integer() >= 0</span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sub-list of <span class="code">List1</span> starting at <span class="code">Start</span>
and with (max) <span class="code">Len</span> elements. It is not an error for
<span class="code">Start+Len</span> to exceed the length of the list.</p>
<div class="example"><pre>
> <span class="bold_code">lists:sublist([1,2,3,4], 2, 2).</span>
[2,3]
> <span class="bold_code">lists:sublist([1,2,3,4], 2, 5).</span>
[2,3,4]
> <span class="bold_code">lists:sublist([1,2,3,4], 5, 2).</span>
[]</pre></div>
</p></div>
<p><a name="subtract-2"></a><span class="bold_code">subtract(List1, List2) -> List3</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = List3 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a new list <span class="code">List3</span> which is a copy of
<span class="code">List1</span>, subjected to the following procedure: for each
element in <span class="code">List2</span>, its first occurrence in <span class="code">List1</span>
is deleted. For example:</p>
<div class="example"><pre>
> <span class="bold_code">lists:subtract("123212", "212").</span>
"312".</pre></div>
<p><span class="code">lists:subtract(A, B)</span> is equivalent to <span class="code">A -- B</span>.</p>
<div class="warning">
<div class="label">Warning</div>
<div class="content"><p><p>The complexity of <span class="code">lists:subtract(A, B)</span> is proportional
to <span class="code">length(A)*length(B)</span>, meaning that it will be very slow if
both <span class="code">A</span> and <span class="code">B</span> are long lists.
(Using ordered lists and
<span class="bold_code"><a href="ordsets.html#subtract-2">ordsets:subtract/2</a></span>
is a much better choice if both lists are long.)</p></p></div>
</div>
</p></div>
<p><a name="suffix-2"></a><span class="bold_code">suffix(List1, List2) -> boolean()</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns <span class="code">true</span> if <span class="code">List1</span> is a suffix of
<span class="code">List2</span>, otherwise <span class="code">false</span>.</p>
</p></div>
<p><a name="sum-1"></a><span class="bold_code">sum(List) -> number()</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List = [number()]</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sum of the elements in <span class="code">List</span>.</p>
</p></div>
<p><a name="takewhile-2"></a><span class="bold_code">takewhile(Pred, List1) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Pred = fun((Elem :: T) -> boolean())</span></div>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Takes elements <span class="code">Elem</span> from <span class="code">List1</span> while
<span class="code">Pred(Elem)</span> returns <span class="code">true</span>, that is,
the function returns the longest prefix of the list for which
all elements satisfy the predicate.</p>
</p></div>
<p><a name="ukeymerge-3"></a><span class="bold_code">ukeymerge(N, TupleList1, TupleList2) -> TupleList3</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 1</span></div>
<div class="REFBODY">1..tuple_size(Tuple)</div>
<div class="REFTYPES"><span class="bold_code">TupleList1 = [T1]</span></div>
<div class="REFTYPES"><span class="bold_code">TupleList2 = [T2]</span></div>
<div class="REFTYPES"><span class="bold_code">TupleList3 = [(T1 | T2)]</span></div>
<div class="REFTYPES"><span class="bold_code">T1 = T2 = Tuple</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Tuple = tuple()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sorted list formed by merging <span class="code">TupleList1</span>
and <span class="code">TupleList2</span>. The merge is performed on the
<span class="code">N</span>th element of each tuple. Both <span class="code">TupleList1</span> and
<span class="code">TupleList2</span> must be key-sorted without duplicates
prior to evaluating this function. When two tuples compare
equal, the tuple from <span class="code">TupleList1</span> is picked and the
one from <span class="code">TupleList2</span> deleted.</p>
</p></div>
<p><a name="ukeysort-2"></a><span class="bold_code">ukeysort(N, TupleList1) -> TupleList2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">N = integer() >= 1</span></div>
<div class="REFBODY">1..tuple_size(Tuple)</div>
<div class="REFTYPES"><span class="bold_code">TupleList1 = TupleList2 = [Tuple]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">Tuple = tuple()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list containing the sorted elements of the list
<span class="code">TupleList1</span> where all but the first tuple of the
tuples comparing equal have been deleted. Sorting is
performed on the <span class="code">N</span>th element of the tuples.</p>
</p></div>
<p><a name="umerge-1"></a><span class="bold_code">umerge(ListOfLists) -> List1</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">ListOfLists = [List]</span></div>
<div class="REFTYPES"><span class="bold_code">List = List1 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sorted list formed by merging all the sub-lists
of <span class="code">ListOfLists</span>. All sub-lists must be sorted and
contain no duplicates prior to evaluating this function.
When two elements compare equal, the element from the
sub-list with the lowest position in <span class="code">ListOfLists</span> is
picked and the other one deleted.</p>
</p></div>
<p><a name="umerge-2"></a><span class="bold_code">umerge(List1, List2) -> List3</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = [X]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [Y]</span></div>
<div class="REFTYPES"><span class="bold_code">List3 = [(X | Y)]</span></div>
<div class="REFTYPES"><span class="bold_code">X = Y = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sorted list formed by merging <span class="code">List1</span> and
<span class="code">List2</span>. Both <span class="code">List1</span> and <span class="code">List2</span> must be
sorted and contain no duplicates prior to evaluating this
function. When two elements compare equal, the element from
<span class="code">List1</span> is picked and the one from <span class="code">List2</span>
deleted.</p>
</p></div>
<p><a name="umerge-3"></a><span class="bold_code">umerge(Fun, List1, List2) -> List3</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Fun = fun((A, B) -> boolean())</span></div>
<div class="REFTYPES"><span class="bold_code">List1 = [A]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [B]</span></div>
<div class="REFTYPES"><span class="bold_code">List3 = [(A | B)]</span></div>
<div class="REFTYPES"><span class="bold_code">A = B = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sorted list formed by merging <span class="code">List1</span> and
<span class="code">List2</span>. Both <span class="code">List1</span> and <span class="code">List2</span> must be
sorted according to the <span class="bold_code"><a href="#ordering_function">ordering function</a></span>
<span class="code">Fun</span> and contain no duplicates prior to evaluating
this function. <span class="code">Fun(A, B)</span> should return <span class="code">true</span> if
<span class="code">A</span> compares less than or equal to <span class="code">B</span> in the
ordering, <span class="code">false</span> otherwise. When two elements compare
equal, the element from
<span class="code">List1</span> is picked and the one from <span class="code">List2</span>
deleted.</p>
</p></div>
<p><a name="umerge3-3"></a><span class="bold_code">umerge3(List1, List2, List3) -> List4</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = [X]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [Y]</span></div>
<div class="REFTYPES"><span class="bold_code">List3 = [Z]</span></div>
<div class="REFTYPES"><span class="bold_code">List4 = [(X | Y | Z)]</span></div>
<div class="REFTYPES"><span class="bold_code">X = Y = Z = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns the sorted list formed by merging <span class="code">List1</span>,
<span class="code">List2</span> and <span class="code">List3</span>. All of <span class="code">List1</span>,
<span class="code">List2</span> and <span class="code">List3</span> must be sorted and contain no
duplicates prior to evaluating this function. When two
elements compare equal, the element from <span class="code">List1</span> is
picked if there is such an element, otherwise the element
from <span class="code">List2</span> is picked, and the other one deleted.</p>
</p></div>
<p><a name="unzip-1"></a><span class="bold_code">unzip(List1) -> {List2, List3}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = [{A, B}]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [A]</span></div>
<div class="REFTYPES"><span class="bold_code">List3 = [B]</span></div>
<div class="REFTYPES"><span class="bold_code">A = B = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>"Unzips" a list of two-tuples into two lists, where the first
list contains the first element of each tuple, and the second
list contains the second element of each tuple.</p>
</p></div>
<p><a name="unzip3-1"></a><span class="bold_code">unzip3(List1) -> {List2, List3, List4}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = [{A, B, C}]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [A]</span></div>
<div class="REFTYPES"><span class="bold_code">List3 = [B]</span></div>
<div class="REFTYPES"><span class="bold_code">List4 = [C]</span></div>
<div class="REFTYPES"><span class="bold_code">A = B = C = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>"Unzips" a list of three-tuples into three lists, where
the first list contains the first element of each tuple,
the second list contains the second element of each tuple, and
the third list contains the third element of each tuple.</p>
</p></div>
<p><a name="usort-1"></a><span class="bold_code">usort(List1) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list containing the sorted elements of
<span class="code">List1</span> where all but the first element of the elements
comparing equal have been deleted.</p>
</p></div>
<p><a name="usort-2"></a><span class="bold_code">usort(Fun, List1) -> List2</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Fun = fun((T, T) -> boolean())</span></div>
<div class="REFTYPES"><span class="bold_code">List1 = List2 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code">T = term()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Returns a list which contains the sorted elements of
<span class="code">List1</span> where all but the first element of the elements
comparing equal according to the <span class="bold_code"><a href="#ordering_function">ordering function</a></span>
<span class="code">Fun</span> have been deleted. <span class="code">Fun(A, B)</span> should return
<span class="code">true</span> if <span class="code">A</span> compares less than or equal to
<span class="code">B</span> in the ordering, <span class="code">false</span> otherwise.</p>
</p></div>
<p><a name="zip-2"></a><span class="bold_code">zip(List1, List2) -> List3</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = [A]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [B]</span></div>
<div class="REFTYPES"><span class="bold_code">List3 = [{A, B}]</span></div>
<div class="REFTYPES"><span class="bold_code">A = B = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>"Zips" two lists of equal length into one list of two-tuples,
where the first element of each tuple is taken from the first
list and the second element is taken from corresponding
element in the second list.</p>
</p></div>
<p><a name="zip3-3"></a><span class="bold_code">zip3(List1, List2, List3) -> List4</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">List1 = [A]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [B]</span></div>
<div class="REFTYPES"><span class="bold_code">List3 = [C]</span></div>
<div class="REFTYPES"><span class="bold_code">List4 = [{A, B, C}]</span></div>
<div class="REFTYPES"><span class="bold_code">A = B = C = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>"Zips" three lists of equal length into one list of
three-tuples, where the first element of each tuple is taken
from the first list, the second element is taken from
corresponding element in the second list, and the third
element is taken from the corresponding element in the third
list.</p>
</p></div>
<p><a name="zipwith-3"></a><span class="bold_code">zipwith(Combine, List1, List2) -> List3</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Combine = fun((X, Y) -> T)</span></div>
<div class="REFTYPES"><span class="bold_code">List1 = [X]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [Y]</span></div>
<div class="REFTYPES"><span class="bold_code">List3 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code">X = Y = T = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Combine the elements of two lists of equal length into one
list. For each pair <span class="code">X, Y</span> of list elements from the two
lists, the element in the result list will be
<span class="code">Combine(X, Y)</span>.</p>
<p><span class="code">zipwith(fun(X, Y) -> {X,Y} end, List1, List2)</span> is
equivalent to <span class="code">zip(List1, List2)</span>.</p>
<p>Example:</p>
<div class="example"><pre>
> <span class="bold_code">lists:zipwith(fun(X, Y) -> X+Y end, [1,2,3], [4,5,6]).</span>
[5,7,9]</pre></div>
</p></div>
<p><a name="zipwith3-4"></a><span class="bold_code">zipwith3(Combine, List1, List2, List3) -> List4</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Combine = fun((X, Y, Z) -> T)</span></div>
<div class="REFTYPES"><span class="bold_code">List1 = [X]</span></div>
<div class="REFTYPES"><span class="bold_code">List2 = [Y]</span></div>
<div class="REFTYPES"><span class="bold_code">List3 = [Z]</span></div>
<div class="REFTYPES"><span class="bold_code">List4 = [T]</span></div>
<div class="REFTYPES"><span class="bold_code">X = Y = Z = T = term()</span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
<div class="REFTYPES"><span class="bold_code"></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Combine the elements of three lists of equal length into one
list. For each triple <span class="code">X, Y, Z</span> of list elements from
the three lists, the element in the result list will be
<span class="code">Combine(X, Y, Z)</span>.</p>
<p><span class="code">zipwith3(fun(X, Y, Z) -> {X,Y,Z} end, List1, List2, List3)</span> is equivalent to <span class="code">zip3(List1, List2, List3)</span>.</p>
<p>Examples:</p>
<div class="example"><pre>
> <span class="bold_code">lists:zipwith3(fun(X, Y, Z) -> X+Y+Z end, [1,2,3], [4,5,6], [7,8,9]).</span>
[12,15,18]
> <span class="bold_code">lists:zipwith3(fun(X, Y, Z) -> [X,Y,Z] end, [a,b,c], [x,y,z], [1,2,3]).</span>
[[a,x,1],[b,y,2],[c,z,3]]</pre></div>
</p></div>
</div>
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