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An ES6 implementation of the debounce function. "Debouncing enforces that a function not be called again until a certain amount of time has passed without it being called. As in 'execute this function only if 100 milliseconds have passed without it being called.'" - CSS-Tricks (https://css-tricks.com/the-difference-between-throttling-and-debounc…
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function debounce(callback, wait, immediate = false) { | |
let timeout = null | |
return function() { | |
const callNow = immediate && !timeout | |
const next = () => callback.apply(this, arguments) | |
clearTimeout(timeout) | |
timeout = setTimeout(next, wait) | |
if (callNow) { | |
next() | |
} | |
} | |
} | |
/** | |
* Normal event | |
* event | | | | |
* time ---------------- | |
* callback | | | | |
* | |
* Call log only when it's been 100ms since the last sroll | |
* scroll | | | | |
* time ---------------- | |
* callback | | | |
* |100| |100| | |
*/ | |
const handleScroll = debounce((arg, event) => { | |
console.log(`${arg} ${event.type}`) | |
}, 100, true) | |
window.addEventListener('scroll', (event) => { | |
handleScroll('Event is:', event) | |
}) |
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