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version</a></strong> (0.63).</div></div><div class="docItemContainer_1tAC"><article><div><span class="badge badge--secondary">Version: Next</span></div><header><h1 class="docTitle_cWlf">Easing</h1></header><div class="markdown"><p>The <code>Easing</code> module implements common easing functions. This module is used by <a href="/docs/next/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/" target="_blank" rel="noopener noreferrer">http://easings.net/</a></p><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="predefined-animations"></a>Predefined animations<a aria-hidden="true" tabindex="-1" class="hash-link" href="#predefined-animations" title="Direct link to heading">#</a></h3><p>The <code>Easing</code> module provides several predefined animations through the following methods:</p><ul><li><a href="/docs/next/easing#back"><code>back</code></a> provides a basic animation where the object goes slightly back before moving forward</li><li><a href="/docs/next/easing#bounce"><code>bounce</code></a> provides a bouncing animation</li><li><a href="/docs/next/easing#ease"><code>ease</code></a> provides a basic inertial animation</li><li><a href="/docs/next/easing#elastic"><code>elastic</code></a> provides a basic spring interaction</li></ul><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="standard-functions"></a>Standard functions<a aria-hidden="true" tabindex="-1" class="hash-link" href="#standard-functions" title="Direct link to heading">#</a></h3><p>Three standard easing functions are provided:</p><ul><li><a href="/docs/next/easing#linear"><code>linear</code></a></li><li><a href="/docs/next/easing#quad"><code>quad</code></a></li><li><a href="/docs/next/easing#cubic"><code>cubic</code></a></li></ul><p>The <a href="/docs/next/easing#poly"><code>poly</code></a> function can be used to implement quartic, quintic, and other higher power functions.</p><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="additional-functions"></a>Additional functions<a aria-hidden="true" tabindex="-1" class="hash-link" href="#additional-functions" title="Direct link to heading">#</a></h3><p>Additional mathematical functions are provided by the following methods:</p><ul><li><a href="/docs/next/easing#bezier"><code>bezier</code></a> provides a cubic bezier curve</li><li><a href="/docs/next/easing#circle"><code>circle</code></a> provides a circular function</li><li><a href="/docs/next/easing#sin"><code>sin</code></a> provides a sinusoidal function</li><li><a href="/docs/next/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="/docs/next/easing#in"><code>in</code></a> runs an easing function forwards</li><li><a href="/docs/next/easing#inout"><code>inOut</code></a> makes any easing function symmetrical</li><li><a href="/docs/next/easing#out"><code>out</code></a> runs an easing function backwards</li></ul><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="example"></a>Example<a aria-hidden="true" tabindex="-1" class="hash-link" href="#example" title="Direct link to heading">#</a></h2><div class="snack-player" data-snack-name="Easing Demo" data-snack-description="Example usage" data-snack-code="import%20React%20from%20%22react%22%3B%0Aimport%20%7B%20Animated%2C%20Easing%2C%20SectionList%2C%20StatusBar%2C%20StyleSheet%2C%20Text%2C%20TouchableOpacity%2C%20View%20%7D%20from%20%22react-native%22%3B%0A%0Aconst%20App%20%3D%20()%20%3D%3E%20%7B%0A%20%20let%20opacity%20%3D%20new%20Animated.Value(0)%3B%0A%0A%20%20const%20animate%20%3D%20easing%20%3D%3E%20%7B%0A%20%20%20%20opacity.setValue(0)%3B%0A%20%20%20%20Animated.timing(opacity%2C%20%7B%0A%20%20%20%20%20%20toValue%3A%201%2C%0A%20%20%20%20%20%20duration%3A%201200%2C%0A%20%20%20%20%20%20easing%0A%20%20%20%20%7D).start()%3B%0A%20%20%7D%3B%0A%0A%20%20const%20size%20%3D%20opacity.interpolate(%7B%0A%20%20%20%20inputRange%3A%20%5B0%2C%201%5D%2C%0A%20%20%20%20outputRange%3A%20%5B0%2C%2080%5D%0A%20%20%7D)%3B%0A%0A%20%20const%20animatedStyles%20%3D%20%5B%0A%20%20%20%20styles.box%2C%0A%20%20%20%20%7B%0A%20%20%20%20%20%20opacity%2C%0A%20%20%20%20%20%20width%3A%20size%2C%0A%20%20%20%20%20%20height%3A%20size%0A%20%20%20%20%7D%0A%20%20%5D%3B%0A%0A%20%20return%20(%0A%20%20%20%20%3CView%20style%3D%7Bstyles.container%7D%3E%0A%20%20%20%20%20%20%3CStatusBar%20hidden%3D%7Btrue%7D%20%2F%3E%0A%20%20%20%20%20%20%3CText%20style%3D%7Bstyles.title%7D%3E%0A%20%20%20%20%20%20%20%20Press%20rows%20below%20to%20preview%20the%20Easing!%0A%20%20%20%20%20%20%3C%2FText%3E%0A%20%20%20%20%20%20%3CView%20style%3D%7Bstyles.boxContainer%7D%3E%0A%20%20%20%20%20%20%20%20%3CAnimated.View%20style%3D%7BanimatedStyles%7D%20%2F%3E%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20%20%20%3CSectionList%0A%20%20%20%20%20%20%20%20style%3D%7Bstyles.list%7D%0A%20%20%20%20%20%20%20%20sections%3D%7BSECTIONS%7D%0A%20%20%20%20%20%20%20%20keyExtractor%3D%7B(item)%20%3D%3E%20item.title%7D%0A%20%20%20%20%20%20%20%20renderItem%3D%7B(%7B%20item%20%7D)%20%3D%3E%20(%0A%20%20%20%20%20%20%20%20%20%20%3CTouchableOpacity%0A%20%20%20%20%20%20%20%20%20%20%20%20onPress%3D%7B()%20%3D%3E%20animate(item.easing)%7D%0A%20%20%20%20%20%20%20%20%20%20%20%20style%3D%7Bstyles.listRow%7D%0A%20%20%20%20%20%20%20%20%20%20%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CText%3E%7Bitem.title%7D%3C%2FText%3E%0A%20%20%20%20%20%20%20%20%20%20%3C%2FTouchableOpacity%3E%0A%20%20%20%20%20%20%20%20)%7D%0A%20%20%20%20%20%20%20%20renderSectionHeader%3D%7B(%7B%20section%3A%20%7B%20title%20%7D%20%7D)%20%3D%3E%20(%0A%20%20%20%20%20%20%20%20%20%20%3CText%20style%3D%7Bstyles.listHeader%7D%3E%7Btitle%7D%3C%2FText%3E%0A%20%20%20%20%20%20%20%20)%7D%0A%20%20%20%20%20%20%2F%3E%0A%20%20%20%20%3C%2FView%3E%0A%20%20)%3B%0A%7D%3B%0A%0Aconst%20SECTIONS%20%3D%20%5B%0A%20%20%7B%0A%20%20%20%20title%3A%20%22Predefined%20animations%22%2C%0A%20%20%20%20data%3A%20%5B%0A%20%20%20%20%20%20%7B%20title%3A%20%22Bounce%22%2C%20easing%3A%20Easing.bounce%20%7D%2C%0A%20%20%20%20%20%20%7B%20title%3A%20%22Ease%22%2C%20easing%3A%20Easing.ease%20%7D%2C%0A%20%20%20%20%20%20%7B%20title%3A%20%22Elastic%22%2C%20easing%3A%20Easing.elastic(4)%20%7D%0A%20%20%20%20%5D%0A%20%20%7D%2C%0A%20%20%7B%0A%20%20%20%20title%3A%20%22Standard%20functions%22%2C%0A%20%20%20%20data%3A%20%5B%0A%20%20%20%20%20%20%7B%20title%3A%20%22Linear%22%2C%20easing%3A%20Easing.linear%20%7D%2C%0A%20%20%20%20%20%20%7B%20title%3A%20%22Quad%22%2C%20easing%3A%20Easing.quad%20%7D%2C%0A%20%20%20%20%20%20%7B%20title%3A%20%22Cubic%22%2C%20easing%3A%20Easing.cubic%20%7D%0A%20%20%20%20%5D%0A%20%20%7D%2C%0A%20%20%7B%0A%20%20%20%20title%3A%20%22Additional%20functions%22%2C%0A%20%20%20%20data%3A%20%5B%0A%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20title%3A%20%22Bezier%22%2C%0A%20%20%20%20%20%20%20%20easing%3A%20Easing.bezier(0%2C%202%2C%201%2C%20-1)%0A%20%20%20%20%20%20%7D%2C%0A%20%20%20%20%20%20%7B%20title%3A%20%22Circle%22%2C%20easing%3A%20Easing.circle%20%7D%2C%0A%20%20%20%20%20%20%7B%20title%3A%20%22Sin%22%2C%20easing%3A%20Easing.sin%20%7D%2C%0A%20%20%20%20%20%20%7B%20title%3A%20%22Exp%22%2C%20easing%3A%20Easing.exp%20%7D%0A%20%20%20%20%5D%0A%20%20%7D%2C%0A%20%20%7B%0A%20%20%20%20title%3A%20%22Combinations%22%2C%0A%20%20%20%20data%3A%20%5B%0A%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20title%3A%20%22In%20%2B%20Bounce%22%2C%0A%20%20%20%20%20%20%20%20easing%3A%20Easing.in(Easing.bounce)%0A%20%20%20%20%20%20%7D%2C%0A%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20title%3A%20%22Out%20%2B%20Exp%22%2C%0A%20%20%20%20%20%20%20%20easing%3A%20Easing.out(Easing.exp)%0A%20%20%20%20%20%20%7D%2C%0A%20%20%20%20%20%20%7B%0A%20%20%20%20%20%20%20%20title%3A%20%22InOut%20%2B%20Elastic%22%2C%0A%20%20%20%20%20%20%20%20easing%3A%20Easing.inOut(Easing.elastic(1))%0A%20%20%20%20%20%20%7D%0A%20%20%20%20%5D%0A%20%20%7D%0A%5D%3B%0A%0Aconst%20styles%20%3D%20StyleSheet.create(%7B%0A%20%20container%3A%20%7B%0A%20%20%20%20flex%3A%201%2C%0A%20%20%20%20backgroundColor%3A%20%22%2320232a%22%0A%20%20%7D%2C%0A%20%20title%3A%20%7B%0A%20%20%20%20marginTop%3A%2010%2C%0A%20%20%20%20textAlign%3A%20%22center%22%2C%0A%20%20%20%20color%3A%20%22%2361dafb%22%0A%20%20%7D%2C%0A%20%20boxContainer%3A%20%7B%0A%20%20%20%20height%3A%20160%2C%0A%20%20%20%20alignItems%3A%20%22center%22%0A%20%20%7D%2C%0A%20%20box%3A%20%7B%0A%20%20%20%20marginTop%3A%2032%2C%0A%20%20%20%20borderRadius%3A%204%2C%0A%20%20%20%20backgroundColor%3A%20%22%2361dafb%22%0A%20%20%7D%2C%0A%20%20list%3A%20%7B%0A%20%20%20%20backgroundColor%3A%20%22%23fff%22%0A%20%20%7D%2C%0A%20%20listHeader%3A%20%7B%0A%20%20%20%20paddingHorizontal%3A%208%2C%0A%20%20%20%20paddingVertical%3A%204%2C%0A%20%20%20%20backgroundColor%3A%20%22%23f4f4f4%22%2C%0A%20%20%20%20color%3A%20%22%23999%22%2C%0A%20%20%20%20fontSize%3A%2012%2C%0A%20%20%20%20textTransform%3A%20%22uppercase%22%0A%20%20%7D%2C%0A%20%20listRow%3A%20%7B%0A%20%20%20%20padding%3A%208%0A%20%20%7D%0A%7D)%3B%0A%0Aexport%20default%20App%3B" data-snack-platform="web" data-snack-supported-platforms="ios,android,web" data-snack-theme="light" data-snack-preview="true" data-snack-loading="lazy"></div><hr><h1><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="reference"></a>Reference<a aria-hidden="true" tabindex="-1" class="hash-link" href="#reference" title="Direct link to heading">#</a></h1><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="methods"></a>Methods<a aria-hidden="true" tabindex="-1" class="hash-link" href="#methods" title="Direct link to heading">#</a></h2><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="step0"></a><code>step0()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#step0" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">step0</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">n</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>A stepping function, returns 1 for any positive value of <code>n</code>.</p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="step1"></a><code>step1()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#step1" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">step1</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">n</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>A stepping function, returns 1 if <code>n</code> is greater than or equal to 1.</p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="linear"></a><code>linear()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#linear" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">linear</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">t</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><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" target="_blank" rel="noopener noreferrer">http://cubic-bezier.com/#0,0,1,1</a></p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="ease"></a><code>ease()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#ease" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">ease</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">t</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>A basic inertial interaction, similar to an object slowly accelerating to speed.</p><p><a href="http://cubic-bezier.com/#.42,0,1,1" target="_blank" rel="noopener noreferrer">http://cubic-bezier.com/#.42,0,1,1</a></p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="quad"></a><code>quad()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#quad" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">quad</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">t</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><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" target="_blank" rel="noopener noreferrer">http://easings.net/#easeInQuad</a></p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="cubic"></a><code>cubic()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#cubic" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">cubic</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">t</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><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" target="_blank" rel="noopener noreferrer">http://easings.net/#easeInCubic</a></p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="poly"></a><code>poly()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#poly" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">poly</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">n</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>A power function. Position is equal to the Nth power of elapsed time.</p><p>n = 4: <a href="http://easings.net/#easeInQuart" target="_blank" rel="noopener noreferrer">http://easings.net/#easeInQuart</a> n = 5: <a href="http://easings.net/#easeInQuint" target="_blank" rel="noopener noreferrer">http://easings.net/#easeInQuint</a></p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="sin"></a><code>sin()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#sin" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">sin</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">t</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>A sinusoidal function.</p><p><a href="http://easings.net/#easeInSine" target="_blank" rel="noopener noreferrer">http://easings.net/#easeInSine</a></p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="circle"></a><code>circle()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#circle" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">circle</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">t</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>A circular function.</p><p><a href="http://easings.net/#easeInCirc" target="_blank" rel="noopener noreferrer">http://easings.net/#easeInCirc</a></p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="exp"></a><code>exp()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#exp" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">exp</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">t</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>An exponential function.</p><p><a href="http://easings.net/#easeInExpo" target="_blank" rel="noopener noreferrer">http://easings.net/#easeInExpo</a></p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="elastic"></a><code>elastic()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#elastic" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">elastic</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">bounciness</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>A basic 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&#x27;t overshoot at all, and bounciness of N &gt; 1 will overshoot about N times.</p><p><a href="http://easings.net/#easeInElastic" target="_blank" rel="noopener noreferrer">http://easings.net/#easeInElastic</a></p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="back"></a><code>back()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#back" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">back</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">s</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Use with <code>Animated.parallel()</code> to create a basic effect where the object animates back slightly as the animation starts.</p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="bounce"></a><code>bounce()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#bounce" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">bounce</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">t</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Provides a basic bouncing effect.</p><p><a href="http://easings.net/#easeInBounce" target="_blank" rel="noopener noreferrer">http://easings.net/#easeInBounce</a></p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="bezier"></a><code>bezier()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#bezier" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">bezier</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">x1</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> y1</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> x2</span><span class="token punctuation" style="color:#657b83">,</span><span class="token plain"> y2</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Provides a cubic bezier curve, equivalent to CSS Transitions&#x27; <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/" target="_blank" rel="noopener noreferrer">http://cubic-bezier.com/</a></p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="in"></a><code>in()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#in" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token keyword" style="color:#c5a5c5">in</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">easing</span><span class="token punctuation" style="color:#657b83">)</span><span class="token punctuation" style="color:#657b83">;</span></div></div></div></div></div><p>Runs an easing function forwards.</p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="out"></a><code>out()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#out" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">out</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">easing</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><p>Runs an easing function backwards.</p><hr><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_3pqN" id="inout"></a><code>inOut()</code><a aria-hidden="true" tabindex="-1" class="hash-link" href="#inout" title="Direct link to heading">#</a></h3><div class="mdxCodeBlock_xYIz"><div class="codeBlockContent_rlEb"><button tabindex="0" type="button" aria-label="Copy code to clipboard" class="copyButton_kOW4">Copy</button><div class="prism-code language-jsx codeBlock_1AP7"><div class="codeBlockLines_1boI" style="color:#FFFFFF;background:#282C34"><div class="token-line" style="color:#FFFFFF;background:#282C34"><span class="token keyword" style="color:#c5a5c5">static</span><span class="token plain"> </span><span class="token function" style="color:#79b6f2">inOut</span><span class="token punctuation" style="color:#657b83">(</span><span class="token plain">easing</span><span class="token punctuation" style="color:#657b83">)</span></div></div></div></div></div><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></div></article><div class="docMetadata margin-vert--xl"><div class="row"><div class="col"><a href="https://github.com/facebook/react-native-website/blob/master/website/../docs/easing.md" target="_blank" rel="noreferrer noopener"><svg fill="currentColor" height="1.2em" width="1.2em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 40 40" style="margin-right:0.3em;vertical-align:sub"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col text--right"><em><small class="docMetadata-updated">Last updated on <time datetime="2020-05-15T20:33:11.000Z" class="docLastUpdatedAt_1gIo">5/15/2020</time></small></em></div></div></div><div class="margin-vert--lg"><nav class="pagination-nav" aria-label="Blog list page navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/docs/next/dimensions"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« Dimensions</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/docs/next/interactionmanager"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">InteractionManager »</div></a></div></nav></div></div></div><div class="col col--3"><div class="tableOfContents_3iuQ"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#predefined-animations" class="table-of-contents__link">Predefined animations</a></li><li><a href="#standard-functions" class="table-of-contents__link">Standard functions</a></li><li><a href="#additional-functions" class="table-of-contents__link">Additional functions</a></li><li><a href="#example" class="table-of-contents__link">Example</a></li><li><a href="#methods" class="table-of-contents__link">Methods</a><ul><li><a href="#step0" class="table-of-contents__link"><code>step0()</code></a></li><li><a href="#step1" class="table-of-contents__link"><code>step1()</code></a></li><li><a href="#linear" class="table-of-contents__link"><code>linear()</code></a></li><li><a href="#ease" class="table-of-contents__link"><code>ease()</code></a></li><li><a href="#quad" class="table-of-contents__link"><code>quad()</code></a></li><li><a href="#cubic" class="table-of-contents__link"><code>cubic()</code></a></li><li><a href="#poly" class="table-of-contents__link"><code>poly()</code></a></li><li><a href="#sin" class="table-of-contents__link"><code>sin()</code></a></li><li><a href="#circle" class="table-of-contents__link"><code>circle()</code></a></li><li><a href="#exp" class="table-of-contents__link"><code>exp()</code></a></li><li><a href="#elastic" class="table-of-contents__link"><code>elastic()</code></a></li><li><a href="#back" class="table-of-contents__link"><code>back()</code></a></li><li><a href="#bounce" class="table-of-contents__link"><code>bounce()</code></a></li><li><a href="#bezier" class="table-of-contents__link"><code>bezier()</code></a></li><li><a href="#in" class="table-of-contents__link"><code>in()</code></a></li><li><a href="#out" class="table-of-contents__link"><code>out()</code></a></li><li><a href="#inout" class="table-of-contents__link"><code>inOut()</code></a></li></ul></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container"><div class="row footer__links"><div class="col footer__col"><h4 class="footer__title">Docs</h4><ul class="footer__items"><li class="footer__item"><a class="footer__link-item" href="/docs/getting-started">Getting Started</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/tutorial">Tutorial</a></li><li class="footer__item"><a class="footer__link-item" href="/docs/components-and-apis">Components 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