react-spy-scroll
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Scrollspy components for react
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<a href="index.html">All files</a> utils.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Utility functions
*/
import requestAnimationFrame from './request-animation-frame';
export function filterUndefined(obj) {
return Object.keys(obj)
.map((key) => ({ key, value: obj[key] }))
.filter(({ value }) => typeof value !== 'undefined')
.reduce((acc, { key, value }) => ({ ...acc, [key]: value }), {});
}
export function throttle(callback) {
let requestedFrame;
let args;
let self;
function callbackCheck() {
if (args || self) {
requestedFrame = requestAnimationFrame(callbackCheck);
callback.apply(self, args);
} else {
requestedFrame = null;
}
args = self = null;
}
return function throttleProxy(...a) {
// eslint-disable-next-line no-unused-expressions
requestedFrame || (requestedFrame = requestAnimationFrame(callbackCheck));
args = a;
self = this;
};
}
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