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<h1>Penlight</h1>
<ul>
<li><a href="../index.html">Index</a></li>
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<h2>Contents</h2>
<ul>
<li><a href="#Fields">Fields</a></li>
<li><a href="#Methods">Methods</a></li>
<li><a href="#Metamethods">Metamethods</a></li>
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<h2>Classes</h2>
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<li><a href="../classes/pl.Date.html">pl.Date</a></li>
<li><a href="../classes/pl.List.html">pl.List</a></li>
<li><strong>pl.Map</strong></li>
<li><a href="../classes/pl.MultiMap.html">pl.MultiMap</a></li>
<li><a href="../classes/pl.OrderedMap.html">pl.OrderedMap</a></li>
</ul>
<h2>Libraries</h2>
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<li><a href="../libraries/pl.html">pl</a></li>
<li><a href="../libraries/pl.Set.html">pl.Set</a></li>
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<h2>Manual</h2>
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<li><a href="../manual/01-introduction.md.html">Introduction</a></li>
<li><a href="../manual/02-arrays.md.html">Tables and Arrays</a></li>
<li><a href="../manual/03-strings.md.html">Strings. Higher-level operations on strings.</a></li>
<li><a href="../manual/04-paths.md.html">Paths and Directories</a></li>
<li><a href="../manual/05-dates.md.html">Date and Time</a></li>
<li><a href="../manual/06-data.md.html">Data</a></li>
<li><a href="../manual/07-functional.md.html">Functional Programming</a></li>
<li><a href="../manual/08-additional.md.html">Additional Libraries</a></li>
<li><a href="../manual/09-discussion.md.html">Technical Choices</a></li>
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<h2>Examples</h2>
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<li><a href="../examples/seesubst.lua.html">seesubst.lua</a></li>
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<h1>Class <code>pl.Map</code></h1>
<p>A Map class.</p>
<p>
<pre>
> Map = <span class="global">require</span> <span class="string">'pl.Map'</span>
> m = Map{one=<span class="number">1</span>,two=<span class="number">2</span>}
> m:update {three=<span class="number">3</span>,four=<span class="number">4</span>,two=<span class="number">20</span>}
> = m == M{one=<span class="number">1</span>,two=<span class="number">20</span>,three=<span class="number">3</span>,four=<span class="number">4</span>}
<span class="keyword">true</span>
</pre>
<p> Dependencies: <a href="../libraries/pl.utils.html#">pl.utils</a>, <a href="../libraries/pl.class.html#">pl.class</a>, <a href="../libraries/pl.tablex.html#">pl.tablex</a>, <a href="../libraries/pl.pretty.html#">pl.pretty</a></p>
</p>
<h2><a href="#Fields">Fields</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#pl.Map.keys">pl.Map.keys</a></td>
<td class="summary">list of keys.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#pl.Map.values">pl.Map.values</a></td>
<td class="summary">list of values.</td>
</tr>
</table>
<h2><a href="#Methods">Methods</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#pl.Map:iter">pl.Map:iter ()</a></td>
<td class="summary">return an iterator over all key-value pairs.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#pl.Map:items">pl.Map:items ()</a></td>
<td class="summary">return a List of all key-value pairs, sorted by the keys.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#pl.Map:len">pl.Map:len ()</a></td>
<td class="summary">size of map.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#pl.Map:set">pl.Map:set (key, val)</a></td>
<td class="summary">put a value into the map.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#pl.Map:get">pl.Map:get (key)</a></td>
<td class="summary">get a value from the map.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#pl.Map:getvalues">pl.Map:getvalues (keys)</a></td>
<td class="summary">get a list of values indexed by a list of keys.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#pl.Map:update">pl.Map:update (table)</a></td>
<td class="summary">update the map using key/value pairs from another table.</td>
</tr>
</table>
<h2><a href="#Metamethods">Metamethods</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#pl.Map:__eq">pl.Map:__eq (m)</a></td>
<td class="summary">equality between maps.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#pl.Map:__tostring">pl.Map:__tostring ()</a></td>
<td class="summary">string representation of a map.</td>
</tr>
</table>
<br/>
<br/>
<h2><a name="Fields"></a>Fields</h2>
<dl class="function">
<dt>
<a name = "pl.Map.keys"></a>
<strong>pl.Map.keys</strong>
</dt>
<dd>
list of keys.
</dd>
<dt>
<a name = "pl.Map.values"></a>
<strong>pl.Map.values</strong>
</dt>
<dd>
list of values.
</dd>
</dl>
<h2><a name="Methods"></a>Methods</h2>
<dl class="function">
<dt>
<a name = "pl.Map:iter"></a>
<strong>pl.Map:iter ()</strong>
</dt>
<dd>
return an iterator over all key-value pairs.
</dd>
<dt>
<a name = "pl.Map:items"></a>
<strong>pl.Map:items ()</strong>
</dt>
<dd>
return a List of all key-value pairs, sorted by the keys.
</dd>
<dt>
<a name = "pl.Map:len"></a>
<strong>pl.Map:len ()</strong>
</dt>
<dd>
size of map.
note: this is a relatively expensive operation!
</dd>
<dt>
<a name = "pl.Map:set"></a>
<strong>pl.Map:set (key, val)</strong>
</dt>
<dd>
put a value into the map.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">key</span>
the key
</li>
<li><span class="parameter">val</span>
the value
</li>
</ul>
</dd>
<dt>
<a name = "pl.Map:get"></a>
<strong>pl.Map:get (key)</strong>
</dt>
<dd>
get a value from the map.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">key</span>
the key
</li>
</ul>
<h3>Returns:</h3>
<ol>
the value, or nil if not found.
</ol>
</dd>
<dt>
<a name = "pl.Map:getvalues"></a>
<strong>pl.Map:getvalues (keys)</strong>
</dt>
<dd>
get a list of values indexed by a list of keys.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">keys</span>
a list-like table of keys
</li>
</ul>
<h3>Returns:</h3>
<ol>
a new list
</ol>
</dd>
<dt>
<a name = "pl.Map:update"></a>
<strong>pl.Map:update (table)</strong>
</dt>
<dd>
update the map using key/value pairs from another table.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">table</span>
<span class="types"><span class="type">tab</span></span>
</li>
</ul>
</dd>
</dl>
<h2><a name="Metamethods"></a>Metamethods</h2>
<dl class="function">
<dt>
<a name = "pl.Map:__eq"></a>
<strong>pl.Map:__eq (m)</strong>
</dt>
<dd>
equality between maps.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">m</span>
<span class="types"><a class="type" href="../classes/pl.Map.html">Map</a></span>
another map.
</li>
</ul>
</dd>
<dt>
<a name = "pl.Map:__tostring"></a>
<strong>pl.Map:__tostring ()</strong>
</dt>
<dd>
string representation of a map.
</dd>
</dl>
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