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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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<h1>Penlight</h1>
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<li><a href="../index.html">Index</a></li>
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<h2>Contents</h2>
<ul>
<li><a href="#Functions">Functions</a></li>
</ul>
<h2>Modules</h2>
<ul>
<li><a href="../modules/pl.html">pl</a></li>
<li><a href="../modules/pl.Date.html">pl.Date</a></li>
<li><a href="../modules/pl.List.html">pl.List</a></li>
<li><a href="../modules/pl.Map.html">pl.Map</a></li>
<li><a href="../modules/pl.MultiMap.html">pl.MultiMap</a></li>
<li><a href="../modules/pl.OrderedMap.html">pl.OrderedMap</a></li>
<li><strong>pl.Set</strong></li>
<li><a href="../modules/pl.app.html">pl.app</a></li>
<li><a href="../modules/pl.array2d.html">pl.array2d</a></li>
<li><a href="../modules/pl.class.html">pl.class</a></li>
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<li><a href="../modules/pl.config.html">pl.config</a></li>
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<li><a href="../modules/pl.func.html">pl.func</a></li>
<li><a href="../modules/pl.input.html">pl.input</a></li>
<li><a href="../modules/pl.lapp.html">pl.lapp</a></li>
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<li><a href="../modules/pl.permute.html">pl.permute</a></li>
<li><a href="../modules/pl.pretty.html">pl.pretty</a></li>
<li><a href="../modules/pl.seq.html">pl.seq</a></li>
<li><a href="../modules/pl.sip.html">pl.sip</a></li>
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<li><a href="../modules/pl.xml.html">pl.xml</a></li>
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<h2>Topics</h2>
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<li><a href="../topics/01-introduction.md.html">01-introduction.md</a></li>
<li><a href="../topics/02-arrays.md.html">02-arrays.md</a></li>
<li><a href="../topics/03-strings.md.html">03-strings.md</a></li>
<li><a href="../topics/04-paths.md.html">04-paths.md</a></li>
<li><a href="../topics/05-dates.md.html">05-dates.md</a></li>
<li><a href="../topics/06-data.md.html">06-data.md</a></li>
<li><a href="../topics/07-functional.md.html">07-functional.md</a></li>
<li><a href="../topics/08-additional.md.html">08-additional.md</a></li>
<li><a href="../topics/09-discussion.md.html">09-discussion.md</a></li>
</ul>
<h2>Examples</h2>
<ul>
<li><a href="../examples/seesubst.lua.html">seesubst.lua</a></li>
<li><a href="../examples/sipscan.lua.html">sipscan.lua</a></li>
<li><a href="../examples/symbols.lua.html">symbols.lua</a></li>
<li><a href="../examples/test-cmp.lua.html">test-cmp.lua</a></li>
<li><a href="../examples/test-data.lua.html">test-data.lua</a></li>
<li><a href="../examples/test-listcallbacks.lua.html">test-listcallbacks.lua</a></li>
<li><a href="../examples/test-pretty.lua.html">test-pretty.lua</a></li>
<li><a href="../examples/test-symbols.lua.html">test-symbols.lua</a></li>
<li><a href="../examples/testapp.lua.html">testapp.lua</a></li>
<li><a href="../examples/testclone.lua.html">testclone.lua</a></li>
<li><a href="../examples/testconfig.lua.html">testconfig.lua</a></li>
<li><a href="../examples/testglobal.lua.html">testglobal.lua</a></li>
<li><a href="../examples/testinputfields.lua.html">testinputfields.lua</a></li>
<li><a href="../examples/testinputfields2.lua.html">testinputfields2.lua</a></li>
<li><a href="../examples/testxml.lua.html">testxml.lua</a></li>
<li><a href="../examples/which.lua.html">which.lua</a></li>
</ul>
</div>
<div id="content">
<h1>Module <code>pl.Set</code></h1>
<p>A Set class.</p>
<p><pre><code> > Set = require 'pl.Set'
> = Set{'one','two'} == Set{'two','one'}
true
> fruit = Set{'apple','banana','orange'}
> = fruit['banana']
true
> = fruit['hazelnut']
nil
> colours = Set{'red','orange','green','blue'}
> = fruit,colours
[apple,orange,banana] [blue,green,orange,red]
> = fruit+colours
[blue,green,apple,red,orange,banana]
> = fruit*colours
[orange]
</code></pre>
<p> Depdencies: <a href="../modules/pl.utils.html#">pl.utils</a> , <a href="../modules/pl.tablex.html#">pl.tablex</a> , <a href="../modules/pl.class.html#">pl.class</a> </p>
</p>
<h2><a href="#Functions">Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#Set">Set (t)</a></td>
<td class="summary">create a set.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#values">values (self)</a></td>
<td class="summary">get a list of the values in a set.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#map">map (self, fn, ...)</a></td>
<td class="summary">map a function over the values of a set.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#union">union (self, set)</a></td>
<td class="summary">union of two sets (also +).</td>
</tr>
<tr>
<td class="name" nowrap><a href="#intersection">intersection (self, set)</a></td>
<td class="summary">intersection of two sets (also *).</td>
</tr>
<tr>
<td class="name" nowrap><a href="#difference">difference (self, set)</a></td>
<td class="summary">new set with elements in the set that are not in the other (also –).</td>
</tr>
<tr>
<td class="name" nowrap><a href="#issubset">issubset (self, set)</a></td>
<td class="summary">is the first set a subset of the second (also <)?.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#issempty">issempty (self)</a></td>
<td class="summary">is the set empty?.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#isdisjoint">isdisjoint (s1, s2)</a></td>
<td class="summary">are the sets disjoint?</td>
</tr>
</table>
<br/>
<br/>
<h2><a name="Functions"></a>Functions</h2>
<dl class="function">
<dt>
<a name = "Set"></a>
<strong>Set (t)</strong>
</dt>
<dd>
create a set. <br>
<h3>Parameters:</h3>
<ul>
<li><code><em>t</em></code>: may be a Set, Map or list-like table.</li>
</ul>
</dd>
<dt>
<a name = "values"></a>
<strong>values (self)</strong>
</dt>
<dd>
get a list of the values in a set.
<h3>Parameters:</h3>
<ul>
<li><code><em>self</em></code>: a Set</li>
</ul>
</dd>
<dt>
<a name = "map"></a>
<strong>map (self, fn, ...)</strong>
</dt>
<dd>
map a function over the values of a set.
<h3>Parameters:</h3>
<ul>
<li><code><em>self</em></code>: a Set</li>
<li><code><em>fn</em></code>: a function</li>
<li><code><em>...</em></code>: extra arguments to pass to the function.</li>
</ul>
<h3>Returns:</h3>
<ol>
a new set
</ol>
</dd>
<dt>
<a name = "union"></a>
<strong>union (self, set)</strong>
</dt>
<dd>
union of two sets (also +).
<h3>Parameters:</h3>
<ul>
<li><code><em>self</em></code>: a Set</li>
<li><code><em>set</em></code>: another set</li>
</ul>
<h3>Returns:</h3>
<ol>
a new set
</ol>
</dd>
<dt>
<a name = "intersection"></a>
<strong>intersection (self, set)</strong>
</dt>
<dd>
intersection of two sets (also *).
<h3>Parameters:</h3>
<ul>
<li><code><em>self</em></code>: a Set</li>
<li><code><em>set</em></code>: another set</li>
</ul>
<h3>Returns:</h3>
<ol>
a new set
</ol>
</dd>
<dt>
<a name = "difference"></a>
<strong>difference (self, set)</strong>
</dt>
<dd>
new set with elements in the set that are not in the other (also –).
<h3>Parameters:</h3>
<ul>
<li><code><em>self</em></code>: a Set</li>
<li><code><em>set</em></code>: another set</li>
</ul>
<h3>Returns:</h3>
<ol>
a new set
</ol>
</dd>
<dt>
<a name = "issubset"></a>
<strong>issubset (self, set)</strong>
</dt>
<dd>
is the first set a subset of the second (also <)?.
<h3>Parameters:</h3>
<ul>
<li><code><em>self</em></code>: a Set</li>
<li><code><em>set</em></code>: another set</li>
</ul>
<h3>Returns:</h3>
<ol>
true or false
</ol>
</dd>
<dt>
<a name = "issempty"></a>
<strong>issempty (self)</strong>
</dt>
<dd>
is the set empty?.
<h3>Parameters:</h3>
<ul>
<li><code><em>self</em></code>: a Set</li>
</ul>
<h3>Returns:</h3>
<ol>
true or false
</ol>
</dd>
<dt>
<a name = "isdisjoint"></a>
<strong>isdisjoint (s1, s2)</strong>
</dt>
<dd>
are the sets disjoint? (no elements in common).
Uses naive definition, i.e. that intersection is empty
<h3>Parameters:</h3>
<ul>
<li><code><em>s1</em></code>: a Set</li>
<li><code><em>s2</em></code>: another set</li>
</ul>
<h3>Returns:</h3>
<ol>
true or false
</ol>
</dd>
</dl>
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