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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Easing · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="The `Easing` module implements common easing functions. This module is used by [Animated.timing()](/react-native/docs/animated#timing) to convey physically believable motion in animations."/><meta name="docsearch:version" content="0.58"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Easing · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/react-native/index.html"/><meta property="og:description" content="The `Easing` module implements common easing functions. This module is used by [Animated.timing()](/react-native/docs/animated#timing) to convey physically believable motion in animations."/><meta name="twitter:card" content="summary"/><link rel="shortcut icon" href="/react-native/img/favicon.png"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://facebook.github.io/react-native/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://facebook.github.io/react-native/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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</script></nav></div><div class="container mainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/easing.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Easing</h1></header><article><div><span><p>The <code>Easing</code> module implements common easing functions. This module is used by <a href="/react-native/docs/animated#timing">Animated.timing()</a> to convey physically believable motion in animations.</p>
<p>You can find a visualization of some common easing functions at <a href="http://easings.net/">http://easings.net/</a></p>
<h3><a class="anchor" aria-hidden="true" id="predefined-animations"></a><a href="#predefined-animations" 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>Predefined animations</h3>
<p>The <code>Easing</code> module provides several predefined animations through the following methods:</p>
<ul>
<li><a href="/react-native/docs/easing#back"><code>back</code></a> provides a simple animation where the object goes slightly back before moving forward</li>
<li><a href="/react-native/docs/easing#bounce"><code>bounce</code></a> provides a bouncing animation</li>
<li><a href="/react-native/docs/easing#ease"><code>ease</code></a> provides a simple inertial animation</li>
<li><a href="/react-native/docs/easing#elastic"><code>elastic</code></a> provides a simple spring interaction</li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="standard-functions"></a><a href="#standard-functions" 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>Standard functions</h3>
<p>Three standard easing functions are provided:</p>
<ul>
<li><a href="/react-native/docs/easing#linear"><code>linear</code></a></li>
<li><a href="/react-native/docs/easing#quad"><code>quad</code></a></li>
<li><a href="/react-native/docs/easing#cubic"><code>cubic</code></a></li>
</ul>
<p>The <a href="/react-native/docs/easing#poly"><code>poly</code></a> function can be used to implement quartic, quintic, and other higher power functions.</p>
<h3><a class="anchor" aria-hidden="true" id="additional-functions"></a><a href="#additional-functions" 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>Additional functions</h3>
<p>Additional mathematical functions are provided by the following methods:</p>
<ul>
<li><a href="/react-native/docs/easing#bezier"><code>bezier</code></a> provides a cubic bezier curve</li>
<li><a href="/react-native/docs/easing#circle"><code>circle</code></a> provides a circular function</li>
<li><a href="/react-native/docs/easing#sin"><code>sin</code></a> provides a sinusoidal function</li>
<li><a href="/react-native/docs/easing#exp"><code>exp</code></a> provides an exponential function</li>
</ul>
<p>The following helpers are used to modify other easing functions.</p>
<ul>
<li><a href="/react-native/docs/easing#in"><code>in</code></a> runs an easing function forwards</li>
<li><a href="/react-native/docs/easing#inout"><code>inOut</code></a> makes any easing function symmetrical</li>
<li><a href="/react-native/docs/easing#out"><code>out</code></a> runs an easing function backwards</li>
</ul>
<h3><a class="anchor" aria-hidden="true" id="methods"></a><a href="#methods" 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>Methods</h3>
<ul>
<li><a href="/react-native/docs/easing#step0"><code>step0</code></a></li>
<li><a href="/react-native/docs/easing#step1"><code>step1</code></a></li>
<li><a href="/react-native/docs/easing#linear"><code>linear</code></a></li>
<li><a href="/react-native/docs/easing#ease"><code>ease</code></a></li>
<li><a href="/react-native/docs/easing#quad"><code>quad</code></a></li>
<li><a href="/react-native/docs/easing#cubic"><code>cubic</code></a></li>
<li><a href="/react-native/docs/easing#poly"><code>poly</code></a></li>
<li><a href="/react-native/docs/easing#sin"><code>sin</code></a></li>
<li><a href="/react-native/docs/easing#circle"><code>circle</code></a></li>
<li><a href="/react-native/docs/easing#exp"><code>exp</code></a></li>
<li><a href="/react-native/docs/easing#elastic"><code>elastic</code></a></li>
<li><a href="/react-native/docs/easing#back"><code>back</code></a></li>
<li><a href="/react-native/docs/easing#bounce"><code>bounce</code></a></li>
<li><a href="/react-native/docs/easing#bezier"><code>bezier</code></a></li>
<li><a href="/react-native/docs/easing#in"><code>in</code></a></li>
<li><a href="/react-native/docs/easing#out"><code>out</code></a></li>
<li><a href="/react-native/docs/easing#inout"><code>inOut</code></a></li>
</ul>
<hr>
<h1><a class="anchor" aria-hidden="true" id="reference"></a><a href="#reference" 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>Reference</h1>
<h2><a class="anchor" aria-hidden="true" id="methods-1"></a><a href="#methods-1" 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>Methods</h2>
<h3><a class="anchor" aria-hidden="true" id="step0"></a><a href="#step0" 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>step0()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">step0</span><span class="token punctuation">(</span>n<span class="token punctuation">)</span>
</code></pre>
<p>A stepping function, returns 1 for any positive value of <code>n</code>.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="step1"></a><a href="#step1" 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>step1()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">step1</span><span class="token punctuation">(</span>n<span class="token punctuation">)</span>
</code></pre>
<p>A stepping function, returns 1 if <code>n</code> is greater than or equal to 1.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="linear"></a><a href="#linear" 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>linear()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">linear</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span>
</code></pre>
<p>A linear function, <code>f(t) = t</code>. Position correlates to elapsed time one to one.</p>
<p><a href="http://cubic-bezier.com/#0,0,1,1">http://cubic-bezier.com/#0,0,1,1</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="ease"></a><a href="#ease" 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>ease()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">ease</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span>
</code></pre>
<p>A simple inertial interaction, similar to an object slowly accelerating to speed.</p>
<p><a href="http://cubic-bezier.com/#.42,0,1,1">http://cubic-bezier.com/#.42,0,1,1</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="quad"></a><a href="#quad" 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>quad()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">quad</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span>
</code></pre>
<p>A quadratic function, <code>f(t) = t * t</code>. Position equals the square of elapsed time.</p>
<p><a href="http://easings.net/#easeInQuad">http://easings.net/#easeInQuad</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="cubic"></a><a href="#cubic" 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>cubic()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">cubic</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span>
</code></pre>
<p>A cubic function, <code>f(t) = t * t * t</code>. Position equals the cube of elapsed time.</p>
<p><a href="http://easings.net/#easeInCubic">http://easings.net/#easeInCubic</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="poly"></a><a href="#poly" 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>poly()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">poly</span><span class="token punctuation">(</span>n<span class="token punctuation">)</span>
</code></pre>
<p>A power function. Position is equal to the Nth power of elapsed time.</p>
<p>n = 4: <a href="http://easings.net/#easeInQuart">http://easings.net/#easeInQuart</a> n = 5: <a href="http://easings.net/#easeInQuint">http://easings.net/#easeInQuint</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="sin"></a><a href="#sin" 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>sin()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">sin</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span>
</code></pre>
<p>A sinusoidal function.</p>
<p><a href="http://easings.net/#easeInSine">http://easings.net/#easeInSine</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="circle"></a><a href="#circle" 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>circle()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">circle</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span>
</code></pre>
<p>A circular function.</p>
<p><a href="http://easings.net/#easeInCirc">http://easings.net/#easeInCirc</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="exp"></a><a href="#exp" 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>exp()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">exp</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span>
</code></pre>
<p>An exponential function.</p>
<p><a href="http://easings.net/#easeInExpo">http://easings.net/#easeInExpo</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="elastic"></a><a href="#elastic" 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>elastic()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">elastic</span><span class="token punctuation">(</span>bounciness<span class="token punctuation">)</span>
</code></pre>
<p>A simple elastic interaction, similar to a spring oscillating back and forth.</p>
<p>Default bounciness is 1, which overshoots a little bit once. 0 bounciness doesn't overshoot at all, and bounciness of N &gt; 1 will overshoot about N times.</p>
<p><a href="http://easings.net/#easeInElastic">http://easings.net/#easeInElastic</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="back"></a><a href="#back" 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>back()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">back</span><span class="token punctuation">(</span>s<span class="token punctuation">)</span>
</code></pre>
<p>Use with <code>Animated.parallel()</code> to create a simple effect where the object animates back slightly as the animation starts.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="bounce"></a><a href="#bounce" 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>bounce()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">bounce</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span>
</code></pre>
<p>Provides a simple bouncing effect.</p>
<p><a href="http://easings.net/#easeInBounce">http://easings.net/#easeInBounce</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="bezier"></a><a href="#bezier" 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>bezier()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">bezier</span><span class="token punctuation">(</span>x1<span class="token punctuation">,</span> y1<span class="token punctuation">,</span> x2<span class="token punctuation">,</span> y2<span class="token punctuation">)</span>
</code></pre>
<p>Provides a cubic bezier curve, equivalent to CSS Transitions' <code>transition-timing-function</code>.</p>
<p>A useful tool to visualize cubic bezier curves can be found at <a href="http://cubic-bezier.com/">http://cubic-bezier.com/</a></p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="in"></a><a href="#in" 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>in()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token keyword">in</span> easing<span class="token punctuation">;</span>
</code></pre>
<p>Runs an easing function forwards.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="out"></a><a href="#out" 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>out()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">out</span><span class="token punctuation">(</span>easing<span class="token punctuation">)</span>
</code></pre>
<p>Runs an easing function backwards.</p>
<hr>
<h3><a class="anchor" aria-hidden="true" id="inout"></a><a href="#inout" 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>inOut()</code></h3>
<pre><code class="hljs css language-javascript"><span class="token keyword">static</span> <span class="token function">inOut</span><span class="token punctuation">(</span>easing<span class="token punctuation">)</span>
</code></pre>
<p>Makes any easing function symmetrical. The easing function will run forwards for half of the duration, then backwards for the rest of the duration.</p>
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