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<h1>
<small class="visible-xs">Elixir v1.7.2</small>
MapSet
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/elixir/lib/map_set.ex#L1" title="View Source" class="view-source" rel="help">
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<section id="moduledoc">
<p>Functions that work on sets.</p>
<p><a href="MapSet.html#content"><code class="inline">MapSet</code></a> is the “go to” set data structure in Elixir. A set can be constructed
using <a href="MapSet.html#new/0"><code class="inline">MapSet.new/0</code></a>:</p>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="1690465116-1">(</span><span class="p" data-group-id="1690465116-1">)</span><span class="w">
</span><span class="p" data-group-id="1690465116-2">#</span><span class="nc" data-group-id="1690465116-2">MapSet</span><span class="p" data-group-id="1690465116-2"><</span><span class="p" data-group-id="1690465116-3">[</span><span class="p" data-group-id="1690465116-3">]</span><span class="p" data-group-id="1690465116-2">></span></code></pre>
<p>A set can contain any kind of elements, and elements in a set don’t have to be
of the same type. By definition, sets can’t contain duplicate elements: when
inserting an element in a set where it’s already present, the insertion is
simply a no-op.</p>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="n">map_set</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="7203645306-1">(</span><span class="p" data-group-id="7203645306-1">)</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">put</span><span class="p" data-group-id="7203645306-2">(</span><span class="n">map_set</span><span class="p">,</span><span class="w"> </span><span class="s">"foo"</span><span class="p" data-group-id="7203645306-2">)</span><span class="w">
</span><span class="p" data-group-id="7203645306-3">#</span><span class="nc" data-group-id="7203645306-3">MapSet</span><span class="p" data-group-id="7203645306-3"><</span><span class="p" data-group-id="7203645306-4">[</span><span class="s">"foo"</span><span class="p" data-group-id="7203645306-4">]</span><span class="p" data-group-id="7203645306-3">></span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="n">map_set</span><span class="w"> </span><span class="o">|></span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">put</span><span class="p" data-group-id="7203645306-5">(</span><span class="s">"foo"</span><span class="p" data-group-id="7203645306-5">)</span><span class="w"> </span><span class="o">|></span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">put</span><span class="p" data-group-id="7203645306-6">(</span><span class="s">"foo"</span><span class="p" data-group-id="7203645306-6">)</span><span class="w">
</span><span class="p" data-group-id="7203645306-7">#</span><span class="nc" data-group-id="7203645306-7">MapSet</span><span class="p" data-group-id="7203645306-7"><</span><span class="p" data-group-id="7203645306-8">[</span><span class="s">"foo"</span><span class="p" data-group-id="7203645306-8">]</span><span class="p" data-group-id="7203645306-7">></span></code></pre>
<p>A <a href="MapSet.html#content"><code class="inline">MapSet</code></a> is represented internally using the <code class="inline">%MapSet{}</code> struct. This struct
can be used whenever there’s a need to pattern match on something being a <a href="MapSet.html#content"><code class="inline">MapSet</code></a>:</p>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="n">match?</span><span class="p" data-group-id="6893340746-1">(</span><span class="p" data-group-id="6893340746-2">%</span><span class="nc" data-group-id="6893340746-2">MapSet</span><span class="p" data-group-id="6893340746-2">{</span><span class="p" data-group-id="6893340746-2">}</span><span class="p">,</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="6893340746-3">(</span><span class="p" data-group-id="6893340746-3">)</span><span class="p" data-group-id="6893340746-1">)</span><span class="w">
</span><span class="no">true</span></code></pre>
<p>Note that, however, the struct fields are private and must not be accessed
directly; use the functions in this module to perform operations on sets.</p>
<p><a href="MapSet.html#content"><code class="inline">MapSet</code></a>s can also be constructed starting from other collection-type data
structures: for example, see <a href="MapSet.html#new/1"><code class="inline">MapSet.new/1</code></a> or <a href="Enum.html#into/2"><code class="inline">Enum.into/2</code></a>.</p>
</section>
<section id="summary" class="details-list">
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<a class="hover-link" href="#summary">
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Summary
</h1>
<div class="summary-types summary">
<h2>
<a href="#types">Types</a>
</h2>
<div class="summary-row">
<div class="summary-signature">
<a href="#t:t/0">t()</a>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#t:t/1">t(value)</a>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#t:value/0">value()</a>
</div>
</div>
</div>
<div class="summary-functions summary">
<h2>
<a href="#functions">Functions</a>
</h2>
<div class="summary-row">
<div class="summary-signature">
<a href="#delete/2">delete(map_set, value)</a>
</div>
<div class="summary-synopsis"><p>Deletes <code class="inline">value</code> from <code class="inline">map_set</code></p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#difference/2">difference(map_set1, map_set2)</a>
</div>
<div class="summary-synopsis"><p>Returns a set that is <code class="inline">map_set1</code> without the members of <code class="inline">map_set2</code></p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#disjoint?/2">disjoint?(map_set1, map_set2)</a>
</div>
<div class="summary-synopsis"><p>Checks if <code class="inline">map_set1</code> and <code class="inline">map_set2</code> have no members in common</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#equal?/2">equal?(map_set1, map_set2)</a>
</div>
<div class="summary-synopsis"><p>Checks if two sets are equal</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#intersection/2">intersection(map_set, map_set)</a>
</div>
<div class="summary-synopsis"><p>Returns a set containing only members that <code class="inline">map_set1</code> and <code class="inline">map_set2</code> have in common</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#member?/2">member?(map_set, value)</a>
</div>
<div class="summary-synopsis"><p>Checks if <code class="inline">map_set</code> contains <code class="inline">value</code></p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#new/0">new()</a>
</div>
<div class="summary-synopsis"><p>Returns a new set</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#new/1">new(enumerable)</a>
</div>
<div class="summary-synopsis"><p>Creates a set from an enumerable</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#new/2">new(enumerable, transform)</a>
</div>
<div class="summary-synopsis"><p>Creates a set from an enumerable via the transformation function</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#put/2">put(map_set, value)</a>
</div>
<div class="summary-synopsis"><p>Inserts <code class="inline">value</code> into <code class="inline">map_set</code> if <code class="inline">map_set</code> doesn’t already contain it</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#size/1">size(map_set)</a>
</div>
<div class="summary-synopsis"><p>Returns the number of elements in <code class="inline">map_set</code></p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#subset?/2">subset?(map_set1, map_set2)</a>
</div>
<div class="summary-synopsis"><p>Checks if <code class="inline">map_set1</code>’s members are all contained in <code class="inline">map_set2</code></p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#to_list/1">to_list(map_set)</a>
</div>
<div class="summary-synopsis"><p>Converts <code class="inline">map_set</code> to a list</p>
</div>
</div>
<div class="summary-row">
<div class="summary-signature">
<a href="#union/2">union(map_set1, map_set2)</a>
</div>
<div class="summary-synopsis"><p>Returns a set containing all members of <code class="inline">map_set1</code> and <code class="inline">map_set2</code></p>
</div>
</div>
</div>
</section>
<section id="types" class="details-list">
<h1 class="section-heading">
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Types
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<span class="signature">t()</span>
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<pre>t() :: <a href="#t:t/1">t</a>(<a href="typespecs.html#built-in-types">term</a>())</pre>
</div>
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</section>
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<span class="signature">t(value)</span>
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<span class="note">(opaque)</span>
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<pre><a href="#t:t/1">t</a>(value)</pre>
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</section>
</div>
<div class="detail" id="t:value/0">
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<span class="signature">value()</span>
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<pre>value() :: <a href="typespecs.html#built-in-types">term</a>()</pre>
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<section class="docstring">
</section>
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</div>
</section>
<section id="functions" class="details-list">
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Functions
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<div class="detail" id="delete/2">
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<span class="signature">delete(map_set, value)</span>
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/elixir/lib/map_set.ex#L134" class="view-source" rel="help" title="View Source">
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<div class="specs">
<pre>delete(<a href="#t:t/1">t</a>(val1), val2) :: <a href="#t:t/1">t</a>(val1) when val1: <a href="#t:value/0">value</a>(), val2: <a href="#t:value/0">value</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Deletes <code class="inline">value</code> from <code class="inline">map_set</code>.</p>
<p>Returns a new set which is a copy of <code class="inline">map_set</code> but without <code class="inline">value</code>.</p>
<h2 id="delete/2-examples" class="section-heading">
<a href="#delete/2-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="n">map_set</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="5730681966-1">(</span><span class="p" data-group-id="5730681966-2">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="5730681966-2">]</span><span class="p" data-group-id="5730681966-1">)</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">delete</span><span class="p" data-group-id="5730681966-3">(</span><span class="n">map_set</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p" data-group-id="5730681966-3">)</span><span class="w">
</span><span class="p" data-group-id="5730681966-4">#</span><span class="nc" data-group-id="5730681966-4">MapSet</span><span class="p" data-group-id="5730681966-4"><</span><span class="p" data-group-id="5730681966-5">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="5730681966-5">]</span><span class="p" data-group-id="5730681966-4">></span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">delete</span><span class="p" data-group-id="5730681966-6">(</span><span class="n">map_set</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="5730681966-6">)</span><span class="w">
</span><span class="p" data-group-id="5730681966-7">#</span><span class="nc" data-group-id="5730681966-7">MapSet</span><span class="p" data-group-id="5730681966-7"><</span><span class="p" data-group-id="5730681966-8">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="5730681966-8">]</span><span class="p" data-group-id="5730681966-7">></span></code></pre>
</section>
</div>
<div class="detail" id="difference/2">
<div class="detail-header">
<a href="#difference/2" class="detail-link" title="Link to this function">
<span class="icon-link" aria-hidden="true"></span>
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</a>
<span class="signature">difference(map_set1, map_set2)</span>
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/elixir/lib/map_set.ex#L166" class="view-source" rel="help" title="View Source">
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<div class="specs">
<pre>difference(<a href="#t:t/1">t</a>(val1), <a href="#t:t/1">t</a>(val2)) :: <a href="#t:t/1">t</a>(val1)
when val1: <a href="#t:value/0">value</a>(), val2: <a href="#t:value/0">value</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Returns a set that is <code class="inline">map_set1</code> without the members of <code class="inline">map_set2</code>.</p>
<h2 id="difference/2-examples" class="section-heading">
<a href="#difference/2-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">difference</span><span class="p" data-group-id="0310768187-1">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="0310768187-2">(</span><span class="p" data-group-id="0310768187-3">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="0310768187-3">]</span><span class="p" data-group-id="0310768187-2">)</span><span class="p">,</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="0310768187-4">(</span><span class="p" data-group-id="0310768187-5">[</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p" data-group-id="0310768187-5">]</span><span class="p" data-group-id="0310768187-4">)</span><span class="p" data-group-id="0310768187-1">)</span><span class="w">
</span><span class="p" data-group-id="0310768187-6">#</span><span class="nc" data-group-id="0310768187-6">MapSet</span><span class="p" data-group-id="0310768187-6"><</span><span class="p" data-group-id="0310768187-7">[</span><span class="mi">1</span><span class="p" data-group-id="0310768187-7">]</span><span class="p" data-group-id="0310768187-6">></span></code></pre>
</section>
</div>
<div class="detail" id="disjoint?/2">
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<span class="signature">disjoint?(map_set1, map_set2)</span>
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<pre>disjoint?(<a href="#t:t/0">t</a>(), <a href="#t:t/0">t</a>()) :: <a href="typespecs.html#built-in-types">boolean</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Checks if <code class="inline">map_set1</code> and <code class="inline">map_set2</code> have no members in common.</p>
<h2 id="disjoint?/2-examples" class="section-heading">
<a href="#disjoint?/2-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">disjoint?</span><span class="p" data-group-id="9918956157-1">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="9918956157-2">(</span><span class="p" data-group-id="9918956157-3">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="9918956157-3">]</span><span class="p" data-group-id="9918956157-2">)</span><span class="p">,</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="9918956157-4">(</span><span class="p" data-group-id="9918956157-5">[</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p" data-group-id="9918956157-5">]</span><span class="p" data-group-id="9918956157-4">)</span><span class="p" data-group-id="9918956157-1">)</span><span class="w">
</span><span class="no">true</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">disjoint?</span><span class="p" data-group-id="9918956157-6">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="9918956157-7">(</span><span class="p" data-group-id="9918956157-8">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="9918956157-8">]</span><span class="p" data-group-id="9918956157-7">)</span><span class="p">,</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="9918956157-9">(</span><span class="p" data-group-id="9918956157-10">[</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="9918956157-10">]</span><span class="p" data-group-id="9918956157-9">)</span><span class="p" data-group-id="9918956157-6">)</span><span class="w">
</span><span class="no">false</span></code></pre>
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<span class="signature">equal?(map_set1, map_set2)</span>
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<pre>equal?(<a href="#t:t/0">t</a>(), <a href="#t:t/0">t</a>()) :: <a href="typespecs.html#built-in-types">boolean</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Checks if two sets are equal.</p>
<p>The comparison between elements must be done using <a href="Kernel.html#===/2"><code class="inline">===/2</code></a>.</p>
<h2 id="equal?/2-examples" class="section-heading">
<a href="#equal?/2-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">equal?</span><span class="p" data-group-id="9481524235-1">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="9481524235-2">(</span><span class="p" data-group-id="9481524235-3">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="9481524235-3">]</span><span class="p" data-group-id="9481524235-2">)</span><span class="p">,</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="9481524235-4">(</span><span class="p" data-group-id="9481524235-5">[</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p" data-group-id="9481524235-5">]</span><span class="p" data-group-id="9481524235-4">)</span><span class="p" data-group-id="9481524235-1">)</span><span class="w">
</span><span class="no">true</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">equal?</span><span class="p" data-group-id="9481524235-6">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="9481524235-7">(</span><span class="p" data-group-id="9481524235-8">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="9481524235-8">]</span><span class="p" data-group-id="9481524235-7">)</span><span class="p">,</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="9481524235-9">(</span><span class="p" data-group-id="9481524235-10">[</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p" data-group-id="9481524235-10">]</span><span class="p" data-group-id="9481524235-9">)</span><span class="p" data-group-id="9481524235-6">)</span><span class="w">
</span><span class="no">false</span></code></pre>
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<span class="signature">intersection(map_set, map_set)</span>
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<pre>intersection(<a href="#t:t/1">t</a>(val), <a href="#t:t/1">t</a>(val)) :: <a href="#t:t/1">t</a>(val) when val: <a href="#t:value/0">value</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Returns a set containing only members that <code class="inline">map_set1</code> and <code class="inline">map_set2</code> have in common.</p>
<h2 id="intersection/2-examples" class="section-heading">
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Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">intersection</span><span class="p" data-group-id="8043490558-1">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="8043490558-2">(</span><span class="p" data-group-id="8043490558-3">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="8043490558-3">]</span><span class="p" data-group-id="8043490558-2">)</span><span class="p">,</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="8043490558-4">(</span><span class="p" data-group-id="8043490558-5">[</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p" data-group-id="8043490558-5">]</span><span class="p" data-group-id="8043490558-4">)</span><span class="p" data-group-id="8043490558-1">)</span><span class="w">
</span><span class="p" data-group-id="8043490558-6">#</span><span class="nc" data-group-id="8043490558-6">MapSet</span><span class="p" data-group-id="8043490558-6"><</span><span class="p" data-group-id="8043490558-7">[</span><span class="mi">2</span><span class="p" data-group-id="8043490558-7">]</span><span class="p" data-group-id="8043490558-6">></span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">intersection</span><span class="p" data-group-id="8043490558-8">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="8043490558-9">(</span><span class="p" data-group-id="8043490558-10">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="8043490558-10">]</span><span class="p" data-group-id="8043490558-9">)</span><span class="p">,</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="8043490558-11">(</span><span class="p" data-group-id="8043490558-12">[</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p" data-group-id="8043490558-12">]</span><span class="p" data-group-id="8043490558-11">)</span><span class="p" data-group-id="8043490558-8">)</span><span class="w">
</span><span class="p" data-group-id="8043490558-13">#</span><span class="nc" data-group-id="8043490558-13">MapSet</span><span class="p" data-group-id="8043490558-13"><</span><span class="p" data-group-id="8043490558-14">[</span><span class="p" data-group-id="8043490558-14">]</span><span class="p" data-group-id="8043490558-13">></span></code></pre>
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<span class="signature">member?(map_set, value)</span>
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<pre>member?(<a href="#t:t/0">t</a>(), <a href="#t:value/0">value</a>()) :: <a href="typespecs.html#built-in-types">boolean</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Checks if <code class="inline">map_set</code> contains <code class="inline">value</code>.</p>
<h2 id="member?/2-examples" class="section-heading">
<a href="#member?/2-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">member?</span><span class="p" data-group-id="1944643487-1">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="1944643487-2">(</span><span class="p" data-group-id="1944643487-3">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="1944643487-3">]</span><span class="p" data-group-id="1944643487-2">)</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="1944643487-1">)</span><span class="w">
</span><span class="no">true</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">member?</span><span class="p" data-group-id="1944643487-4">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="1944643487-5">(</span><span class="p" data-group-id="1944643487-6">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="1944643487-6">]</span><span class="p" data-group-id="1944643487-5">)</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p" data-group-id="1944643487-4">)</span><span class="w">
</span><span class="no">false</span></code></pre>
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<span class="signature">new()</span>
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<pre>new() :: <a href="#t:t/0">t</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Returns a new set.</p>
<h2 id="new/0-examples" class="section-heading">
<a href="#new/0-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="1851088866-1">(</span><span class="p" data-group-id="1851088866-1">)</span><span class="w">
</span><span class="p" data-group-id="1851088866-2">#</span><span class="nc" data-group-id="1851088866-2">MapSet</span><span class="p" data-group-id="1851088866-2"><</span><span class="p" data-group-id="1851088866-3">[</span><span class="p" data-group-id="1851088866-3">]</span><span class="p" data-group-id="1851088866-2">></span></code></pre>
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<span class="signature">new(enumerable)</span>
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/elixir/lib/map_set.ex#L75" class="view-source" rel="help" title="View Source">
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<pre>new(<a href="Enum.html#t:t/0">Enum.t</a>()) :: <a href="#t:t/0">t</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Creates a set from an enumerable.</p>
<h2 id="new/1-examples" class="section-heading">
<a href="#new/1-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="8681008785-1">(</span><span class="p" data-group-id="8681008785-2">[</span><span class="ss">:b</span><span class="p">,</span><span class="w"> </span><span class="ss">:a</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="8681008785-2">]</span><span class="p" data-group-id="8681008785-1">)</span><span class="w">
</span><span class="p" data-group-id="8681008785-3">#</span><span class="nc" data-group-id="8681008785-3">MapSet</span><span class="p" data-group-id="8681008785-3"><</span><span class="p" data-group-id="8681008785-4">[</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="ss">:a</span><span class="p">,</span><span class="w"> </span><span class="ss">:b</span><span class="p" data-group-id="8681008785-4">]</span><span class="p" data-group-id="8681008785-3">></span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="8681008785-5">(</span><span class="p" data-group-id="8681008785-6">[</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p" data-group-id="8681008785-6">]</span><span class="p" data-group-id="8681008785-5">)</span><span class="w">
</span><span class="p" data-group-id="8681008785-7">#</span><span class="nc" data-group-id="8681008785-7">MapSet</span><span class="p" data-group-id="8681008785-7"><</span><span class="p" data-group-id="8681008785-8">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="8681008785-8">]</span><span class="p" data-group-id="8681008785-7">></span></code></pre>
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<span class="signature">new(enumerable, transform)</span>
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<pre>new(<a href="Enum.html#t:t/0">Enum.t</a>(), (<a href="typespecs.html#built-in-types">term</a>() -> val)) :: <a href="#t:t/1">t</a>(val) when val: <a href="#t:value/0">value</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Creates a set from an enumerable via the transformation function.</p>
<h2 id="new/2-examples" class="section-heading">
<a href="#new/2-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="1060189168-1">(</span><span class="p" data-group-id="1060189168-2">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p" data-group-id="1060189168-2">]</span><span class="p">,</span><span class="w"> </span><span class="k" data-group-id="1060189168-3">fn</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o">-></span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="k" data-group-id="1060189168-3">end</span><span class="p" data-group-id="1060189168-1">)</span><span class="w">
</span><span class="p" data-group-id="1060189168-4">#</span><span class="nc" data-group-id="1060189168-4">MapSet</span><span class="p" data-group-id="1060189168-4"><</span><span class="p" data-group-id="1060189168-5">[</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p" data-group-id="1060189168-5">]</span><span class="p" data-group-id="1060189168-4">></span></code></pre>
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<span class="signature">put(map_set, value)</span>
<a href="https://github.com/elixir-lang/elixir/blob/v1.7.2/lib/elixir/lib/map_set.ex#L280" class="view-source" rel="help" title="View Source">
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<pre>put(<a href="#t:t/1">t</a>(val), new_val) :: <a href="#t:t/1">t</a>(val | new_val)
when val: <a href="#t:value/0">value</a>(), new_val: <a href="#t:value/0">value</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Inserts <code class="inline">value</code> into <code class="inline">map_set</code> if <code class="inline">map_set</code> doesn’t already contain it.</p>
<h2 id="put/2-examples" class="section-heading">
<a href="#put/2-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">put</span><span class="p" data-group-id="0114906557-1">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="0114906557-2">(</span><span class="p" data-group-id="0114906557-3">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="0114906557-3">]</span><span class="p" data-group-id="0114906557-2">)</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="0114906557-1">)</span><span class="w">
</span><span class="p" data-group-id="0114906557-4">#</span><span class="nc" data-group-id="0114906557-4">MapSet</span><span class="p" data-group-id="0114906557-4"><</span><span class="p" data-group-id="0114906557-5">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="0114906557-5">]</span><span class="p" data-group-id="0114906557-4">></span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">put</span><span class="p" data-group-id="0114906557-6">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="0114906557-7">(</span><span class="p" data-group-id="0114906557-8">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="0114906557-8">]</span><span class="p" data-group-id="0114906557-7">)</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p" data-group-id="0114906557-6">)</span><span class="w">
</span><span class="p" data-group-id="0114906557-9">#</span><span class="nc" data-group-id="0114906557-9">MapSet</span><span class="p" data-group-id="0114906557-9"><</span><span class="p" data-group-id="0114906557-10">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p" data-group-id="0114906557-10">]</span><span class="p" data-group-id="0114906557-9">></span></code></pre>
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<div class="detail" id="size/1">
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<span class="signature">size(map_set)</span>
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<pre>size(<a href="#t:t/0">t</a>()) :: <a href="typespecs.html#basic-types">non_neg_integer</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Returns the number of elements in <code class="inline">map_set</code>.</p>
<h2 id="size/1-examples" class="section-heading">
<a href="#size/1-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">size</span><span class="p" data-group-id="4249596997-1">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="4249596997-2">(</span><span class="p" data-group-id="4249596997-3">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="4249596997-3">]</span><span class="p" data-group-id="4249596997-2">)</span><span class="p" data-group-id="4249596997-1">)</span><span class="w">
</span><span class="mi">3</span></code></pre>
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<div class="detail" id="subset?/2">
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<span class="signature">subset?(map_set1, map_set2)</span>
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<pre>subset?(<a href="#t:t/0">t</a>(), <a href="#t:t/0">t</a>()) :: <a href="typespecs.html#built-in-types">boolean</a>()</pre>
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</div>
<section class="docstring">
<p>Checks if <code class="inline">map_set1</code>’s members are all contained in <code class="inline">map_set2</code>.</p>
<p>This function checks if <code class="inline">map_set1</code> is a subset of <code class="inline">map_set2</code>.</p>
<h2 id="subset?/2-examples" class="section-heading">
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Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">subset?</span><span class="p" data-group-id="2517157222-1">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="2517157222-2">(</span><span class="p" data-group-id="2517157222-3">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="2517157222-3">]</span><span class="p" data-group-id="2517157222-2">)</span><span class="p">,</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="2517157222-4">(</span><span class="p" data-group-id="2517157222-5">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="2517157222-5">]</span><span class="p" data-group-id="2517157222-4">)</span><span class="p" data-group-id="2517157222-1">)</span><span class="w">
</span><span class="no">true</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">subset?</span><span class="p" data-group-id="2517157222-6">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="2517157222-7">(</span><span class="p" data-group-id="2517157222-8">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="2517157222-8">]</span><span class="p" data-group-id="2517157222-7">)</span><span class="p">,</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="2517157222-9">(</span><span class="p" data-group-id="2517157222-10">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="2517157222-10">]</span><span class="p" data-group-id="2517157222-9">)</span><span class="p" data-group-id="2517157222-6">)</span><span class="w">
</span><span class="no">false</span></code></pre>
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<div class="detail" id="to_list/1">
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<span class="signature">to_list(map_set)</span>
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<pre>to_list(<a href="#t:t/1">t</a>(val)) :: [val] when val: <a href="#t:value/0">value</a>()</pre>
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</div>
<section class="docstring">
<p>Converts <code class="inline">map_set</code> to a list.</p>
<h2 id="to_list/1-examples" class="section-heading">
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Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">to_list</span><span class="p" data-group-id="7223322734-1">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="7223322734-2">(</span><span class="p" data-group-id="7223322734-3">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="7223322734-3">]</span><span class="p" data-group-id="7223322734-2">)</span><span class="p" data-group-id="7223322734-1">)</span><span class="w">
</span><span class="p" data-group-id="7223322734-4">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p" data-group-id="7223322734-4">]</span></code></pre>
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<div class="detail" id="union/2">
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<span class="signature">union(map_set1, map_set2)</span>
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<pre>union(<a href="#t:t/1">t</a>(val1), <a href="#t:t/1">t</a>(val2)) :: <a href="#t:t/1">t</a>(val1 | val2)
when val1: <a href="#t:value/0">value</a>(), val2: <a href="#t:value/0">value</a>()</pre>
</div>
</div>
<section class="docstring">
<p>Returns a set containing all members of <code class="inline">map_set1</code> and <code class="inline">map_set2</code>.</p>
<h2 id="union/2-examples" class="section-heading">
<a href="#union/2-examples" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Examples
</h2>
<pre><code class="nohighlight makeup elixir"><span class="gp unselectable">iex> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">union</span><span class="p" data-group-id="5437170010-1">(</span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="5437170010-2">(</span><span class="p" data-group-id="5437170010-3">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p" data-group-id="5437170010-3">]</span><span class="p" data-group-id="5437170010-2">)</span><span class="p">,</span><span class="w"> </span><span class="nc">MapSet</span><span class="o">.</span><span class="n">new</span><span class="p" data-group-id="5437170010-4">(</span><span class="p" data-group-id="5437170010-5">[</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p" data-group-id="5437170010-5">]</span><span class="p" data-group-id="5437170010-4">)</span><span class="p" data-group-id="5437170010-1">)</span><span class="w">
</span><span class="p" data-group-id="5437170010-6">#</span><span class="nc" data-group-id="5437170010-6">MapSet</span><span class="p" data-group-id="5437170010-6"><</span><span class="p" data-group-id="5437170010-7">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">4</span><span class="p" data-group-id="5437170010-7">]</span><span class="p" data-group-id="5437170010-6">></span></code></pre>
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