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Debounce function using Ramda.js
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import { curry, apply } from 'ramda'; | |
/** | |
* Debounce | |
* | |
* @param {Boolean} immediate If true run `fn` at the start of the timeout | |
* @param timeMs {Number} Debounce timeout | |
* @param fn {Function} Function to debounce | |
* | |
* @return {Number} timeout | |
* @example | |
* | |
* const say = (x) => console.log(x) | |
* const debouncedSay = debounce_(false, 1000, say)(); | |
* | |
* debouncedSay("1") | |
* debouncedSay("2") | |
* debouncedSay("3") | |
* | |
*/ | |
const debounce_ = curry((immediate, timeMs, fn) => () => { | |
let timeout; | |
return (...args) => { | |
const later = () => { | |
timeout = null; | |
if (!immediate) { | |
apply(fn, args); | |
} | |
}; | |
const callNow = immediate && !timeout; | |
clearTimeout(timeout); | |
timeout = setTimeout(later, timeMs); | |
if (callNow) { | |
apply(fn, args); | |
} | |
return timeout; | |
}; | |
}); | |
export const debounceImmediate = debounce_(true); | |
export const debounce = debounce_(false); |
Hi @tommmyy
I would like to know why you chose to return a function that returns a function instead of just returning a function on line 23
const debounce_ = curry((immediate, timeMs, fn) => () => {
let timeout;
return (...args) => { ... };
});
By the way, thanks for this useful gist!
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Hi, your solution is very interesting, but at line 26: why don't you use clearTimeout instead of setting timeout= null ?
Looking forward to your response.
Have nice day ! Thanks!