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This module is used by Animated.timing() to convey physically believable motion in animations."><meta data-rh=true property=og:description content="The Easing module implements common easing functions. 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APIs</a></div><ul class=menu__list><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class=menu__link tabindex=0 href=/docs/actionsheetios>ActionSheetIOS</a><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class=menu__link tabindex=0 href=/docs/dynamiccolorios>DynamicColorIOS</a><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-3 menu__list-item"><a class=menu__link tabindex=0 href=/docs/settings>Settings</a></ul></ul></ul></nav></div></div></aside><main class=docMainContainer_a9sJ><div class="container padding-top--md padding-bottom--lg"><div class=row><div class="col docItemCol_Qr34"><div class=docItemContainer_tjFy><article><div class="tocCollapsible_wXna theme-doc-toc-mobile tocMobile_Ojys"><button type=button class="clean-btn tocCollapsibleButton_iI2p">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Easing</h1></header><p>The <code>Easing</code> module implements common easing functions. This module is used by <a href=/docs/animated#timing><code>Animated.timing()</code></a> to convey physically believable motion in animations.</p> 5<p>You can find a visualization of some common easing functions at <a href=https://easings.net/ target=_blank rel="noopener noreferrer">https://easings.net/</a></p> 6<h3 class="anchor anchorWithStickyNavbar_JmGV" id=predefined-animations>Predefined animations<a href=#predefined-animations class=hash-link aria-label="Direct link to Predefined animations" title="Direct link to Predefined animations">​</a></h3> 7<p>The <code>Easing</code> module provides several predefined animations through the following methods:</p> 8<ul> 9<li><a href=/docs/easing#back><code>back</code></a> provides a basic animation where the object goes slightly back before moving forward</li> 10<li><a href=/docs/easing#bounce><code>bounce</code></a> provides a bouncing animation</li> 11<li><a href=/docs/easing#ease><code>ease</code></a> provides a basic inertial animation</li> 12<li><a href=/docs/easing#elastic><code>elastic</code></a> provides a basic spring interaction</li> 13</ul> 14<h3 class="anchor anchorWithStickyNavbar_JmGV" id=standard-functions>Standard functions<a href=#standard-functions class=hash-link aria-label="Direct link to Standard functions" title="Direct link to Standard functions">​</a></h3> 15<p>Three standard easing functions are provided:</p> 16<ul> 17<li><a href=/docs/easing#linear><code>linear</code></a></li> 18<li><a href=/docs/easing#quad><code>quad</code></a></li> 19<li><a href=/docs/easing#cubic><code>cubic</code></a></li> 20</ul> 21<p>The <a href=/docs/easing#poly><code>poly</code></a> function can be used to implement quartic, quintic, and other higher power functions.</p> 22<h3 class="anchor anchorWithStickyNavbar_JmGV" id=additional-functions>Additional functions<a href=#additional-functions class=hash-link aria-label="Direct link to Additional functions" title="Direct link to Additional functions">​</a></h3> 23<p>Additional mathematical functions are provided by the following methods:</p> 24<ul> 25<li><a href=/docs/easing#bezier><code>bezier</code></a> provides a cubic bezier curve</li> 26<li><a href=/docs/easing#circle><code>circle</code></a> provides a circular function</li> 27<li><a href=/docs/easing#sin><code>sin</code></a> provides a sinusoidal function</li> 28<li><a href=/docs/easing#exp><code>exp</code></a> provides an exponential function</li> 29</ul> 30<p>The following helpers are used to modify other easing functions.</p> 31<ul> 32<li><a href=/docs/easing#in><code>in</code></a> runs an easing function forwards</li> 33<li><a href=/docs/easing#inout><code>inOut</code></a> makes any easing function symmetrical</li> 34<li><a href=/docs/easing#out><code>out</code></a> runs an easing function backwards</li> 35</ul> 36<h2 class="anchor anchorWithStickyNavbar_JmGV" id=example>Example<a href=#example class=hash-link aria-label="Direct link to Example" title="Direct link to Example">​</a></h2> 37<div class="tabs-container tabList_J5MA"><ul role=tablist aria-orientation=horizontal class=tabs><li role=tab tabindex=0 aria-selected=true class="tabs__item tabItem_l0OV tabs__item--active">TypeScript<li role=tab tabindex=-1 aria-selected=false class="tabs__item tabItem_l0OV">JavaScript</ul><div class=margin-top--md><div role=tabpanel class=tabItem_wHwb hidden><div class=snack-player data-snack-name="Easing Demo" data-snack-description="Example usage" 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data-snack-dependencies=react-native-safe-area-context data-snack-platform=web data-snack-supported-platforms=ios,android data-snack-theme=light data-snack-preview=true data-snack-loading=lazy data-snack-device-frame=false></div></div><div role=tabpanel class=tabItem_wHwb><div class=snack-player data-snack-name="Easing Demo" data-snack-description="Example usage" 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0%20%20%20%20%20%20title%3A%20'InOut%20%2B%20Elastic'%2C%5Cn%20%20%20%20%20%20%20%20easing%3A%20Easing.inOut(Easing.elastic(1))%2C%5Cn%20%20%20%20%20%20%7D%2C%5Cn%20%20%20%20%5D%2C%5Cn%20%20%7D%2C%5Cn%5D%3B%5Cn%5Cnconst%20styles%20%3D%20StyleSheet.create(%7B%5Cn%20%20container%3A%20%7B%5Cn%20%20%20%20flex%3A%201%2C%5Cn%20%20%20%20backgroundColor%3A%20'%2320232a'%2C%5Cn%20%20%7D%2C%5Cn%20%20title%3A%20%7B%5Cn%20%20%20%20marginTop%3A%2010%2C%5Cn%20%20%20%20textAlign%3A%20'center'%2C%5Cn%20%20%20%20color%3A%20'%2361dafb'%2C%5Cn%20%20%7D%2C%5Cn%20%20boxContainer%3A%20%7B%5Cn%20%20%20%20height%3A%20160%2C%5Cn%20%20%20%20alignItems%3A%20'center'%2C%5Cn%20%20%7D%2C%5Cn%20%20box%3A%20%7B%5Cn%20%20%20%20marginTop%3A%2032%2C%5Cn%20%20%20%20borderRadius%3A%204%2C%5Cn%20%20%20%20backgroundColor%3A%20'%2361dafb'%2C%5Cn%20%20%7D%2C%5Cn%20%20list%3A%20%7B%5Cn%20%20%20%20backgroundColor%3A%20'%23fff'%2C%5Cn%20%20%7D%2C%5Cn%20%20listHeader%3A%20%7B%5Cn%20%20%20%20paddingHorizontal%3A%208%2C%5Cn%20%20%20%20paddingVertical%3A%204%2C%5Cn%20%20%20%20backgroundColor%3A%20'%23f4f4f4'%2C%5Cn%20%20%20%20color%3A%20'%23999'%2C%5Cn%20%20%20%20fontSize%3A%2012%2C%5Cn%20%20%20%20textTransform%3A%20'uppercase'%2C%5Cn%20%20%7D%2C%5Cn%20%20listRow%3A%20%7B%5Cn%20%20%20%20padding%3A%208%2C%5Cn%20%20%7D%2C%5Cn%7D)%3B%5Cn%5Cnexport%20default%20App%3B%22%7D%7D" data-snack-dependencies=react-native-safe-area-context data-snack-platform=web data-snack-supported-platforms=ios,android,web data-snack-theme=light data-snack-preview=true data-snack-loading=lazy data-snack-device-frame=false></div></div></div></div> 38<hr> 39<h1>Reference</h1> 40<h2 class="anchor anchorWithStickyNavbar_JmGV" id=methods>Methods<a href=#methods class=hash-link aria-label="Direct link to Methods" title="Direct link to Methods">​</a></h2> 41<h3 class="anchor anchorWithStickyNavbar_JmGV" id=step0><code>step0()</code><a href=#step0 class=hash-link aria-label="Direct link to step0" title="Direct link to step0">​</a></h3> 42<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 43<p>A stepping function, returns 1 for any positive value of <code>n</code>.</p> 44<hr> 45<h3 class="anchor anchorWithStickyNavbar_JmGV" id=step1><code>step1()</code><a href=#step1 class=hash-link aria-label="Direct link to step1" title="Direct link to step1">​</a></h3> 46<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 47<p>A stepping function, returns 1 if <code>n</code> is greater than or equal to 1.</p> 48<hr> 49<h3 class="anchor anchorWithStickyNavbar_JmGV" id=linear><code>linear()</code><a href=#linear class=hash-link aria-label="Direct link to linear" title="Direct link to linear">​</a></h3> 50<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 51<p>A linear function, <code>f(t) = t</code>. Position correlates to elapsed time one to one.</p> 52<p><a href=https://cubic-bezier.com/#0,0,1,1 target=_blank rel="noopener noreferrer">https://cubic-bezier.com/#0,0,1,1</a></p> 53<hr> 54<h3 class="anchor anchorWithStickyNavbar_JmGV" id=ease><code>ease()</code><a href=#ease class=hash-link aria-label="Direct link to ease" title="Direct link to ease">​</a></h3> 55<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 56<p>A basic inertial interaction, similar to an object slowly accelerating to speed.</p> 57<p><a href=https://cubic-bezier.com/#.42,0,1,1 target=_blank rel="noopener noreferrer">https://cubic-bezier.com/#.42,0,1,1</a></p> 58<hr> 59<h3 class="anchor anchorWithStickyNavbar_JmGV" id=quad><code>quad()</code><a href=#quad class=hash-link aria-label="Direct link to quad" title="Direct link to quad">​</a></h3> 60<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 61<p>A quadratic function, <code>f(t) = t * t</code>. Position equals the square of elapsed time.</p> 62<p><a href=https://easings.net/#easeInQuad target=_blank rel="noopener noreferrer">https://easings.net/#easeInQuad</a></p> 63<hr> 64<h3 class="anchor anchorWithStickyNavbar_JmGV" id=cubic><code>cubic()</code><a href=#cubic class=hash-link aria-label="Direct link to cubic" title="Direct link to cubic">​</a></h3> 65<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 66<p>A cubic function, <code>f(t) = t * t * t</code>. Position equals the cube of elapsed time.</p> 67<p><a href=https://easings.net/#easeInCubic target=_blank rel="noopener noreferrer">https://easings.net/#easeInCubic</a></p> 68<hr> 69<h3 class="anchor anchorWithStickyNavbar_JmGV" id=poly><code>poly()</code><a href=#poly class=hash-link aria-label="Direct link to poly" title="Direct link to poly">​</a></h3> 70<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 71<p>A power function. Position is equal to the Nth power of elapsed time.</p> 72<p>n = 4: <a href=https://easings.net/#easeInQuart target=_blank rel="noopener noreferrer">https://easings.net/#easeInQuart</a> n = 5: <a href=https://easings.net/#easeInQuint target=_blank rel="noopener noreferrer">https://easings.net/#easeInQuint</a></p> 73<hr> 74<h3 class="anchor anchorWithStickyNavbar_JmGV" id=sin><code>sin()</code><a href=#sin class=hash-link aria-label="Direct link to sin" title="Direct link to sin">​</a></h3> 75<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 76<p>A sinusoidal function.</p> 77<p><a href=https://easings.net/#easeInSine target=_blank rel="noopener noreferrer">https://easings.net/#easeInSine</a></p> 78<hr> 79<h3 class="anchor anchorWithStickyNavbar_JmGV" id=circle><code>circle()</code><a href=#circle class=hash-link aria-label="Direct link to circle" title="Direct link to circle">​</a></h3> 80<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 81<p>A circular function.</p> 82<p><a href=https://easings.net/#easeInCirc target=_blank rel="noopener noreferrer">https://easings.net/#easeInCirc</a></p> 83<hr> 84<h3 class="anchor anchorWithStickyNavbar_JmGV" id=exp><code>exp()</code><a href=#exp class=hash-link aria-label="Direct link to exp" title="Direct link to exp">​</a></h3> 85<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 86<p>An exponential function.</p> 87<p><a href=https://easings.net/#easeInExpo target=_blank rel="noopener noreferrer">https://easings.net/#easeInExpo</a></p> 88<hr> 89<h3 class="anchor anchorWithStickyNavbar_JmGV" id=elastic><code>elastic()</code><a href=#elastic class=hash-link aria-label="Direct link to elastic" title="Direct link to elastic">​</a></h3> 90<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 91<p>A basic elastic interaction, similar to a spring oscillating back and forth.</p> 92<p>Default bounciness is 1, which overshoots a little bit once. 0 bounciness doesn't overshoot at all, and bounciness of N > 1 will overshoot about N times.</p> 93<p><a href=https://easings.net/#easeInElastic target=_blank rel="noopener noreferrer">https://easings.net/#easeInElastic</a></p> 94<hr> 95<h3 class="anchor anchorWithStickyNavbar_JmGV" id=back><code>back()</code><a href=#back class=hash-link aria-label="Direct link to back" title="Direct link to back">​</a></h3> 96<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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><br></span></code></pre></div></div> 97<p>Use with <code>Animated.parallel()</code> to create a basic effect where the object animates back slightly as the animation starts.</p> 98<hr> 99<h3 class="anchor anchorWithStickyNavbar_JmGV" id=bounce><code>bounce()</code><a href=#bounce class=hash-link aria-label="Direct link to bounce" title="Direct link to bounce">​</a></h3> 100<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 101<p>Provides a basic bouncing effect.</p> 102<p><a href=https://easings.net/#easeInBounce target=_blank rel="noopener noreferrer">https://easings.net/#easeInBounce</a></p> 103<hr> 104<h3 class="anchor anchorWithStickyNavbar_JmGV" id=bezier><code>bezier()</code><a href=#bezier class=hash-link aria-label="Direct link to bezier" title="Direct link to bezier">​</a></h3> 105<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"> y1</span><span class="token operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"> x2</span><span class="token operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"> y2</span><span class="token operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 106<p>Provides a cubic bezier curve, equivalent to CSS Transitions' <code>transition-timing-function</code>.</p> 107<p>A useful tool to visualize cubic bezier curves can be found at <a href=https://cubic-bezier.com/ target=_blank rel="noopener noreferrer">https://cubic-bezier.com/</a></p> 108<hr> 109<h3 class="anchor anchorWithStickyNavbar_JmGV" id=in><code>in()</code><a href=#in class=hash-link aria-label="Direct link to in" title="Direct link to in">​</a></h3> 110<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 111<p>Runs an easing function forwards.</p> 112<hr> 113<h3 class="anchor anchorWithStickyNavbar_JmGV" id=out><code>out()</code><a href=#out class=hash-link aria-label="Direct link to out" title="Direct link to out">​</a></h3> 114<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 115<p>Runs an easing function backwards.</p> 116<hr> 117<h3 class="anchor anchorWithStickyNavbar_JmGV" id=inout><code>inOut()</code><a href=#inout class=hash-link aria-label="Direct link to inout" title="Direct link to inout">​</a></h3> 118<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><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 operator" style=color:#fc929e>:</span><span class="token plain"> </span><span class="token builtin" style=color:#2aa198>number</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div> 119<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.</div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class=editButtons_t0bR><a href=https://github.com/facebook/react-native-website/edit/main/docs/easing.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_bHB7 aria-hidden=true><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"/></g></svg>Edit page for next release</a><a href=https://github.com/facebook/react-native-website/edit/main/website/versioned_docs/version-0.79/easing.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_bHB7 aria-hidden=true><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 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