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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Boolean functions · JSONata</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta name="generator" content="Docusaurus"/><meta name="description" content="## `$boolean()`"/><meta name="docsearch:version" content="2.0.0"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Boolean functions · JSONata"/><meta property="og:type" content="website"/><meta property="og:url" content="http://docs.jsonata.org/"/><meta property="og:description" content="## `$boolean()`"/><meta name="twitter:card" content="summary"/><link rel="shortcut icon" href="/img/jsonata-button.png"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script type="text/javascript" src="https://buttons.github.io/buttons.js"></script><script type="text/javascript" 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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/jsonata-js/jsonata/edit/master/docs/boolean-functions.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Boolean functions</h1></header><article><div><span><h2><a class="anchor" aria-hidden="true" id="boolean"></a><a href="#boolean" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>$boolean()</code></h2>
<p><strong>Signature:</strong> <code>$boolean(arg)</code></p>
<p>Casts the argument to a Boolean using the following rules:</p>
<table>
<thead>
<tr><th>Argument type</th><th>Result</th></tr>
</thead>
<tbody>
<tr><td>Boolean</td><td>unchanged</td></tr>
<tr><td>string: empty</td><td><code>false</code></td></tr>
<tr><td>string: non-empty</td><td><code>true</code></td></tr>
<tr><td>number: 0</td><td><code>false</code></td></tr>
<tr><td>number: non-zero</td><td><code>true</code></td></tr>
<tr><td>null</td><td><code>false</code></td></tr>
<tr><td>array: empty</td><td><code>false</code></td></tr>
<tr><td>array: contains a member that casts to <code>true</code></td><td><code>true</code></td></tr>
<tr><td>array: all members cast to <code>false</code></td><td><code>false</code></td></tr>
<tr><td>object: empty</td><td><code>false</code></td></tr>
<tr><td>object: non-empty</td><td><code>true</code></td></tr>
<tr><td>function</td><td><code>false</code></td></tr>
</tbody>
</table>
<h2><a class="anchor" aria-hidden="true" id="not"></a><a href="#not" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>$not()</code></h2>
<p><strong>Signature:</strong> <code>$not(arg)</code></p>
<p>Returns Boolean NOT on the argument. <code>arg</code> is first cast to a boolean</p>
<h2><a class="anchor" aria-hidden="true" id="exists"></a><a href="#exists" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a><code>$exists()</code></h2>
<p><strong>Signature:</strong> <code>$exists(arg)</code></p>
<p>Returns Boolean <code>true</code> if the arg expression evaluates to a value, or <code>false</code> if the expression does not match anything (e.g. a path to a non-existent field reference).</p>
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/aggregation-functions"><span class="arrow-prev">← </span><span>Aggregation Functions</span></a><a class="docs-next button" href="/array-functions"><span>Array Functions</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#boolean"><code>$boolean()</code></a></li><li><a href="#not"><code>$not()</code></a></li><li><a href="#exists"><code>$exists()</code></a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/jsonata-white-167.png" alt="JSONata"/></a><div><h5>JSONata</h5><a href="http://jsonata.org" target="_blank" rel="noreferrer noopener">JSON query and<br/>transformation language</a><a href="http://try.jsonata.org" target="_blank" rel="noreferrer noopener">Go play in the<br/>JSONata Exerciser</a></div><div><h5>Community</h5><a href="https://stackoverflow.com/questions/tagged/jsonata" target="_blank" rel="noreferrer noopener">Stack Overflow</a><a href="https://jsonata.slack.com/">Project Chat</a><a href="https://twitter.com/" target="_blank" rel="noreferrer noopener">Twitter</a></div><div><h5>More</h5><a href="https://github.com/jsonata-js/jsonata">GitHub</a><a class="github-button" href="https://github.com/jsonata-js/jsonata" data-icon="octicon-star" data-count-href="/jsonata-js/jsonata/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2021 JSONata.org</section></footer></div></body></html>