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2676. Throttle

https://leetcode.com/problems/throttle/

Javascript​

var throttle = function(fn, t) {
    let lastArgs = null
    let isBlocked = false

    const executor = () => {
        if (lastArgs === null) {
            isBlocked = false
            return
        }

        fn(...lastArgs)
        lastArgs = null
        setTimeout(executor, t)
    }

    return function(...args) {
        if (isBlocked) {
            lastArgs = args
            return
        }

        fn(...args)
        isBlocked = true
        setTimeout(executor, t)
    }
};

/**
 * const throttled = throttle(console.log, 100);
 * throttled("log"); // logged immediately.
 * throttled("log"); // logged at t=100ms.
 */

Typescript​

type F = (...args: any[]) => void

function throttle(fn: F, t: number): F {
    let lastArgs: any | null = null
    let isBlocked: Boolean = false

    const executor = () => {
        if (lastArgs === null) {
            isBlocked = false 
            return
        }

        fn(...lastArgs)
        lastArgs = null
        setTimeout(executor, t)
    }
    
    return function (...args) {
        if (isBlocked) {
            lastArgs = args
            return
        }

        fn(...args)
        isBlocked = true
        setTimeout(executor, t)
    }
};