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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>listate Module: listate/extra</title>
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<li><a href="module-listate.html">listate</a></li><li><a href="module-listate_extra.html">listate/extra</a></li>
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<h1 class="page-title">Module: listate/extra</h1>
<section>
<header>
</header>
<article>
<div class="container-overview">
<div class="description"><p>Library for listening on changes of Redux store state.</p></div>
<hr>
<dt>
<h4 class="name" id="module:listate/extra"><span class="type-signature"></span>(require("listate/extra"))(store, listener)</h4>
</dt>
<dd>
<div class="description">
<p>Add/register state change listener for the given store.</p>
<p>It is a wrap around <a href="module-listate.html#.listen">listate.listen</a> that supports enhanced listener settings.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>store</code></td>
<td class="type">
<span class="param-type"><a href="module-listate.html#~Store">module:listate~Store</a></span>
</td>
<td class="description last"><p>Store for which listener should be added/registered.</p></td>
</tr>
<tr>
<td class="name"><code>listener</code></td>
<td class="type">
<span class="param-type">function</span>
|
<span class="param-type">object</span>
</td>
<td class="description last"><p>Specifies listener that should be called on a state change.
Can be a function or an object that defines listener settings/details.
Settings are the same as for listate.listate with the following exceptions.</p>
<h6 class="method-params-label method-subparams-label">Properties</h6>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Argument</th>
<th>Default</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>filter</code></td>
<td class="type">
<span class="param-type">Array</span>
|
<span class="param-type">function</span>
|
<span class="param-type">object</span>
|
<span class="param-type">string</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="default">
(state) => state
</td>
<td class="description last"><p>Specifies which state part will be used inside <code>when</code> to determine
whether the listener should be called.
When an array or an object is passed, the used filter will be result of
<a href="module-listate_extra.html#.getPartFilter">getPartFilter(listener.filter)</a>.
When a string is passed, the used filter will be result of
<a href="module-listate_extra.html#.getFieldFilter">getFieldFilter(listener.filter)</a>.</p></td>
</tr>
<tr>
<td class="name"><code>when</code></td>
<td class="type">
<span class="param-type">function</span>
</td>
<td class="attributes">
<optional><br>
</td>
<td class="default">
unlike
</td>
<td class="description last"><p>Function to determine whether the listener should be called.
By default <a href="module-listate_extra.html#.unlike">unlike</a> is used.</p></td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source method-doc-label method-doc-details-label">Source:</dt>
<dd class="tag-source">
<ul class="dummy">
<li>
<a href="extra.js.html">extra.js</a>,
<a href="extra.js.html#sunlight-1-line-305">line 305</a>
</li>
</ul>
</dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>A function that removes/unsubscribes the listener.</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">function</span>
</dd>
</dl>
</dd>
</div>
<h3 class="subsection-title">Methods</h3>
<dl>
<hr>
<dt>
<h4 class="name" id=".getFieldFilter"><span class="type-signature"><static> </span>getFieldFilter(path)</h4>
</dt>
<dd>
<div class="description">
<p>Return a function that extracts value of the specified field path inside a given object.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>path</code></td>
<td class="type">
<span class="param-type">string</span>
</td>
<td class="description last"><p>Dot-delimited path to a field whose value should be extracted.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source method-doc-label method-doc-details-label">Source:</dt>
<dd class="tag-source">
<ul class="dummy">
<li>
<a href="extra.js.html">extra.js</a>,
<a href="extra.js.html#sunlight-1-line-152">line 152</a>
</li>
</ul>
</dd>
<dt class="tag-see method-doc-label method-doc-details-label">See:</dt>
<dd class="tag-see">
<ul>
<li><a href="module-listate_extra.html#.getPathValue">getPathValue</a></li>
</ul>
</dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>A function that extracts value of the specified field path inside a given object.</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">function</span>
</dd>
</dl>
<h5>Example</h5>
<pre class="sunlight-highlight-javascript">const filter = getFieldFilter('a.d');const obj = { a: { b: { c: 'value' }, d: 17 }, e: 4, f: [1, 'z', null]};filter(obj); // 17filter({a: 1, b: 2}); // undefined</pre>
</dd>
<hr>
<dt>
<h4 class="name" id=".getObjectPart"><span class="type-signature"><static> </span>getObjectPart(source, parts)</h4>
</dt>
<dd>
<div class="description">
<p>Create an object containing specified parts of the given object.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>source</code></td>
<td class="type">
<span class="param-type">object</span>
</td>
<td class="description last"><p>A source object that should be processed.</p></td>
</tr>
<tr>
<td class="name"><code>parts</code></td>
<td class="type">
<span class="param-type">array</span>
|
<span class="param-type">object</span>
|
<span class="param-type">string</span>
</td>
<td class="description last"><p>Specifies which parts of the source object should be extracted.
Parts are described as an object of the following form:
<code>{resultField1: 'path.to.source.part1', resultField2: 'path.to.part2', ...}</code>.
Each field of the object is a property name of resulting object
whose value is the value of specified source object part.<br> String value <code>'field'</code> is equal to <code>{field: 'field'}</code>.
Array value <code>['a', 'b', 'c', ...]</code> is equal to <code>{a: 'a', b: 'b', c: 'c', ...}</code>.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source method-doc-label method-doc-details-label">Source:</dt>
<dd class="tag-source">
<ul class="dummy">
<li>
<a href="extra.js.html">extra.js</a>,
<a href="extra.js.html#sunlight-1-line-103">line 103</a>
</li>
</ul>
</dd>
<dt class="tag-see method-doc-label method-doc-details-label">See:</dt>
<dd class="tag-see">
<ul>
<li><a href="module-listate_extra.html#.getPathValue">getPathValue</a></li>
</ul>
</dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>Object that contains the extracted parts of the source object.</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">object</span>
</dd>
</dl>
<h5>Example</h5>
<pre class="sunlight-highlight-javascript">const obj = { a: { b: { c: 'value', d: true }, e: 4, f: [1, 'z', null] }, g: 7, h: { i: false, j: 0 }, k: 'king', l: 'last'};getObjectPart(obj, {f1: 'a.b.d', f2: 'a.f.1', f3: 'g', f4: 'h.j'}); // {f1: true, f2: 'z', f3: 7, f4: 0}getObjectPart(obj, ['k', 'l']); // {k: 'king', l: 'last'}getObjectPart(obj, 'g'); // {g: 7}</pre>
</dd>
<hr>
<dt>
<h4 class="name" id=".getPartFilter"><span class="type-signature"><static> </span>getPartFilter(parts)</h4>
</dt>
<dd>
<div class="description">
<p>Return a function that creates an object containing the specified parts of a given object.</p>
</div>
<h5>Parameters:</h5>
<table class="params table table-striped">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>parts</code></td>
<td class="type">
<span class="param-type">array</span>
|
<span class="param-type">object</span>
|
<span class="param-type">string</span>
</td>
<td class="description last"><p>Specifies which parts should be extracted (see <a href="module-listate_extra.html#.getObjectPart">getObjectPart</a>).</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source method-doc-label method-doc-details-label">Source:</dt>
<dd class="tag-source">
<ul class="dummy">
<li>
<a href="extra.js.html">extra.js</a>,
<a href="extra.js.html#sunlight-1-line-189">line 189</a>
</li>
</ul>
</dd>
<dt class="tag-see method-doc-label method-doc-details-label">See:</dt>
<dd class="tag-see">
<ul>
<li><a href="module-listate_extra.html#.getObjectPart">getObjectPart</a></li>
</ul>
</dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>A function that creates an object containing the specified parts of a given object.</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">function</span>
</dd>
</dl>
<h5>Example</h5>
<pre class="sunlight-highlight-javascript">const filter = getPartFilter({f1: 'a.b.c', f2: 'h.j', f3: 'k'});const obj = { a: { b: { c: 'value', d: true }, e: 4, f: [1, 'z', null] }, g: 7, h: { i: false, j: 0 }, k: 'king', l: 'last'};filter(obj); // {f1: 'value', f2: 0, f3: 'king'}filter({a: 1, b: 2, k: 73}); // {f1: undefined, f2: undefined, f3: 73}</pre>
</dd>
<hr>
<dt>
<h4 class="name" id=".getPathValue"><span class="type-signature"><static> </span>getPathValue(obj, path)</h4>
</dt>
<dd>
<div class="description">