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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | 3x 3x 1x 3x 6x 6x 4x 3x 3x 6x | import { Callback, CancelCallback } from "./_types";
/**
*
* @example
* Throttle a Function
* ```ts
* const callback = (arg) => console.log(arg);
*
* const throttledCallback = throttle(callback);
*
* throttledCallback(100, 1);
* // wait 50ms
*
* throttledCallback(100, 2);
* // wait 50ms
*
* // callback is called with arg = 2
* ```
*
* @param callback
* @returns
*/
export const throttle = <TArgs extends unknown[] = []>(
callback: Callback<TArgs>
): ((ms: number, ...args: TArgs) => CancelCallback) => {
let timeout: NodeJS.Timeout | undefined;
let lastArgs: TArgs;
const cancel = () => {
clearTimeout(timeout);
};
return (ms, ...args) => {
lastArgs = args;
if (!timeout) {
timeout = setTimeout(() => {
callback(...lastArgs);
timeout = undefined;
}, ms);
}
return cancel;
};
};
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