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<title>JSDoc: Class: Bloom</title>
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<h1 class="page-title">Class: Bloom</h1>
<section>
<header>
<h2>
<span class="ancestors"><a href="module-utils.html">utils</a>.</span>Bloom</h2>
</header>
<article>
<div class="container-overview">
<h4 class="name" id="Bloom"><span class="type-signature"></span>new Bloom<span class="signature">(size, n, tweak, update)</span><span class="type-signature"></span></h4>
<div class="description">
<p>Bloom Filter</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>size</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Filter size in bits.</p></td>
</tr>
<tr>
<td class="name"><code>n</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Number of hash functions.</p></td>
</tr>
<tr>
<td class="name"><code>tweak</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Seed value.</p></td>
</tr>
<tr>
<td class="name"><code>update</code></td>
<td class="type">
<span class="param-type">Number</span>
|
<span class="param-type">String</span>
</td>
<td class="description last"><p>Update type.</p></td>
</tr>
</tbody>
</table>
<h5 class="subsection-title">Properties:</h5>
<table class="props">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>filter</code></td>
<td class="type">
<span class="param-type">Buffer</span>
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>size</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>n</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>tweak</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>update</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Update flag (see Bloom.flags).</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line41">line 41</a>
</li></ul></dd>
</dl>
</div>
<h3 class="subsection-title">Members</h3>
<h4 class="name" id=".flags"><span class="type-signature">(static) </span>flags<span class="type-signature"> :Number</span></h4>
<div class="description">
<p>Bloom filter update flags.</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">Number</span>
</li>
</ul>
<h5 class="subsection-title">Properties:</h5>
<table class="props">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>NONE</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Never update the filter with outpoints.</p></td>
</tr>
<tr>
<td class="name"><code>ALL</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Always update the filter with outpoints.</p></td>
</tr>
<tr>
<td class="name"><code>PUBKEY_ONLY</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Only update the filter with outpoints if it is
&quot;asymmetric&quot; in terms of addresses (pubkey/multisig).</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-default">Default Value:</dt>
<dd class="tag-default"><ul class="dummy">
<li class="object-value"><pre class="prettyprint"><code>{"NONE":0,"ALL":1,"PUBKEY_ONLY":2}</code></pre></li>
</ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line77">line 77</a>
</li></ul></dd>
</dl>
<h4 class="name" id=".flagsByVal"><span class="type-signature">(static, constant) </span>flagsByVal<span class="type-signature"> :<a href="global.html#RevMap">RevMap</a></span></h4>
<div class="description">
<p>Bloom filter update flags by value.</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type"><a href="global.html#RevMap">RevMap</a></span>
</li>
</ul>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line103">line 103</a>
</li></ul></dd>
</dl>
<h4 class="name" id=".MAX_BLOOM_FILTER_SIZE"><span class="type-signature">(static, constant) </span>MAX_BLOOM_FILTER_SIZE<span class="type-signature"> :Number</span></h4>
<div class="description">
<p>Max bloom filter size.</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">Number</span>
</li>
</ul>
<dl class="details">
<dt class="tag-default">Default Value:</dt>
<dd class="tag-default"><ul class="dummy">
<li>36000</li>
</ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line61">line 61</a>
</li></ul></dd>
</dl>
<h4 class="name" id=".MAX_HASH_FUNCS"><span class="type-signature">(static, constant) </span>MAX_HASH_FUNCS<span class="type-signature"> :Number</span></h4>
<div class="description">
<p>Max number of hash functions.</p>
</div>
<h5>Type:</h5>
<ul>
<li>
<span class="param-type">Number</span>
</li>
</ul>
<dl class="details">
<dt class="tag-default">Default Value:</dt>
<dd class="tag-default"><ul class="dummy">
<li>50</li>
</ul></dd>
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line69">line 69</a>
</li></ul></dd>
</dl>
<h3 class="subsection-title">Methods</h3>
<h4 class="name" id=".fromOptions"><span class="type-signature">(static) </span>fromOptions<span class="signature">(size, n, tweak, update)</span><span class="type-signature"> &rarr; {Bloom}</span></h4>
<div class="description">
<p>Instantiate bloom filter from options.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>size</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Filter size in bits.</p></td>
</tr>
<tr>
<td class="name"><code>n</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Number of hash functions.</p></td>
</tr>
<tr>
<td class="name"><code>tweak</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Seed value.</p></td>
</tr>
<tr>
<td class="name"><code>update</code></td>
<td class="type">
<span class="param-type">Number</span>
|
<span class="param-type">String</span>
</td>
<td class="description last"><p>Update type.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line167">line 167</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Bloom</span>
</dd>
</dl>
<h4 class="name" id=".fromRate"><span class="type-signature">(static) </span>fromRate<span class="signature">(items, rate, update)</span><span class="type-signature"> &rarr; {Boolean}</span></h4>
<div class="description">
<p>Create a filter from a false positive rate.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>items</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Expected number of items.</p></td>
</tr>
<tr>
<td class="name"><code>rate</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>False positive rate (0.0-1.0).</p></td>
</tr>
<tr>
<td class="name"><code>update</code></td>
<td class="type">
<span class="param-type">Number</span>
|
<span class="param-type">String</span>
</td>
<td class="description last"></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line265">line 265</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Boolean</span>
</dd>
</dl>
<h5>Example</h5>
<pre class="prettyprint"><code>Bloom.fromRate(800000, 0.0001, 'none');</code></pre>
<h4 class="name" id=".fromRaw"><span class="type-signature">(static) </span>fromRaw<span class="signature">(data, enc<span class="signature-attributes">nullable</span>)</span><span class="type-signature"> &rarr; {Bloom}</span></h4>
<div class="description">
<p>Instantiate bloom filter from serialized data.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>data</code></td>
<td class="type">
<span class="param-type">Buffer</span>
</td>
<td class="attributes">
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>enc</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="attributes">
&lt;nullable><br>
</td>
<td class="description last"></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line381">line 381</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Bloom</span>
</dd>
</dl>
<h4 class="name" id=".fromReader"><span class="type-signature">(static) </span>fromReader<span class="signature">(br)</span><span class="type-signature"> &rarr; {Bloom}</span></h4>
<div class="description">
<p>Instantiate bloom filter from buffer reader.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>br</code></td>
<td class="type">
<span class="param-type">BufferReader</span>
</td>
<td class="description last"></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line370">line 370</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Bloom</span>
</dd>
</dl>
<h4 class="name" id="add"><span class="type-signature"></span>add<span class="signature">(val, enc<span class="signature-attributes">nullable</span>)</span><span class="type-signature"></span></h4>
<div class="description">
<p>Add data to the filter.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>val</code></td>
<td class="type">
<span class="param-type">Buffer</span>
|
<span class="param-type">String</span>
</td>
<td class="attributes">
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>enc</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="attributes">
&lt;nullable><br>
</td>
<td class="description last"><p>Can be any of the Buffer object's encodings.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line196">line 196</a>
</li></ul></dd>
</dl>
<h4 class="name" id="added"><span class="type-signature"></span>added<span class="signature">(val, enc<span class="signature-attributes">nullable</span>)</span><span class="type-signature"> &rarr; {Boolean}</span></h4>
<div class="description">
<p>Test whether data is present in the
filter and potentially add data.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>val</code></td>
<td class="type">
<span class="param-type">Buffer</span>
|
<span class="param-type">String</span>
</td>
<td class="attributes">
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>enc</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="attributes">
&lt;nullable><br>
</td>
<td class="description last"><p>Can be any of the Buffer object's encodings.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line238">line 238</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<div class="param-desc">
<p>Whether data was added.</p>
</div>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Boolean</span>
</dd>
</dl>
<h4 class="name" id="fromOptions"><span class="type-signature">(private) </span>fromOptions<span class="signature">(size, n, tweak, update)</span><span class="type-signature"> &rarr; {Bloom}</span></h4>
<div class="description">
<p>Inject properties from options.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>size</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Filter size in bits.</p></td>
</tr>
<tr>
<td class="name"><code>n</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Number of hash functions.</p></td>
</tr>
<tr>
<td class="name"><code>tweak</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"><p>Seed value.</p></td>
</tr>
<tr>
<td class="name"><code>update</code></td>
<td class="type">
<span class="param-type">Number</span>
|
<span class="param-type">String</span>
</td>
<td class="description last"><p>Update type.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line119">line 119</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Bloom</span>
</dd>
</dl>
<h4 class="name" id="fromRaw"><span class="type-signature">(private) </span>fromRaw<span class="signature">(data)</span><span class="type-signature"></span></h4>
<div class="description">
<p>Inject properties from serialized data.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>data</code></td>
<td class="type">
<span class="param-type">Buffer</span>
</td>
<td class="description last"></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line360">line 360</a>
</li></ul></dd>
</dl>
<h4 class="name" id="fromReader"><span class="type-signature">(private) </span>fromReader<span class="signature">(br)</span><span class="type-signature"></span></h4>
<div class="description">
<p>Inject properties from buffer reader.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>br</code></td>
<td class="type">
<span class="param-type">BufferReader</span>
</td>
<td class="description last"></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line345">line 345</a>
</li></ul></dd>
</dl>
<h4 class="name" id="getSize"><span class="type-signature"></span>getSize<span class="signature">()</span><span class="type-signature"> &rarr; {Number}</span></h4>
<div class="description">
<p>Get serialization size.</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line312">line 312</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Number</span>
</dd>
</dl>
<h4 class="name" id="hash"><span class="type-signature"></span>hash<span class="signature">(val, n)</span><span class="type-signature"> &rarr; {Number}</span></h4>
<div class="description">
<p>Perform the mumur3 hash on data.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>val</code></td>
<td class="type">
<span class="param-type">Buffer</span>
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>n</code></td>
<td class="type">
<span class="param-type">Number</span>
</td>
<td class="description last"></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line178">line 178</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Number</span>
</dd>
</dl>
<h4 class="name" id="isWithinConstraints"><span class="type-signature"></span>isWithinConstraints<span class="signature">()</span><span class="type-signature"> &rarr; {Boolean}</span></h4>
<div class="description">
<p>Ensure the filter is within the size limits.</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line297">line 297</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Boolean</span>
</dd>
</dl>
<h4 class="name" id="reset"><span class="type-signature"></span>reset<span class="signature">()</span><span class="type-signature"></span></h4>
<div class="description">
<p>Reset the filter.</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line186">line 186</a>
</li></ul></dd>
</dl>
<h4 class="name" id="test"><span class="type-signature"></span>test<span class="signature">(val, enc<span class="signature-attributes">nullable</span>)</span><span class="type-signature"> &rarr; {Boolean}</span></h4>
<div class="description">
<p>Test whether data is present in the filter.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Attributes</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>val</code></td>
<td class="type">
<span class="param-type">Buffer</span>
|
<span class="param-type">String</span>
</td>
<td class="attributes">
</td>
<td class="description last"></td>
</tr>
<tr>
<td class="name"><code>enc</code></td>
<td class="type">
<span class="param-type">String</span>
</td>
<td class="attributes">
&lt;nullable><br>
</td>
<td class="description last"><p>Can be any of the Buffer object's encodings.</p></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line215">line 215</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Boolean</span>
</dd>
</dl>
<h4 class="name" id="toRaw"><span class="type-signature"></span>toRaw<span class="signature">()</span><span class="type-signature"> &rarr; {Buffer}</span></h4>
<div class="description">
<p>Serialize bloom filter.</p>
</div>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line334">line 334</a>
</li></ul></dd>
</dl>
<h5>Returns:</h5>
<dl>
<dt>
Type
</dt>
<dd>
<span class="param-type">Buffer</span>
</dd>
</dl>
<h4 class="name" id="toWriter"><span class="type-signature"></span>toWriter<span class="signature">(bw)</span><span class="type-signature"></span></h4>
<div class="description">
<p>Write filter to buffer writer.</p>
</div>
<h5>Parameters:</h5>
<table class="params">
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th class="last">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="name"><code>bw</code></td>
<td class="type">
<span class="param-type">BufferWriter</span>
</td>
<td class="description last"></td>
</tr>
</tbody>
</table>
<dl class="details">
<dt class="tag-source">Source:</dt>
<dd class="tag-source"><ul class="dummy"><li>
<a href="utils_bloom.js.html">utils/bloom.js</a>, <a href="utils_bloom.js.html#line321">line 321</a>
</li></ul></dd>
</dl>
</article>
</section>
</div>
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