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Timed promise queue / throttle

Muddy Mandrill answered on February 5, 2023 Popularity 1/10 Helpfulness 1/10

answer Timed promise queue / throttle

Timed promise queue / throttle

Comment

Timed promise queue / throttle throttling

// call fn at most count times per delay.
const debounce = function (fn, delay, count) {
    let working = 0, queue = [];
    function work() {
        if ((queue.length === 0) || (working === count)) return;
        working++;
        Promise.delay(delay).tap(() => working--).then(work);
        let {context, args, resolve} = queue.shift();
        resolve(fn.apply(context, args));
    }
    return function debounced() {
        return new Promise(resolve => {
            queue.push({context: this, args: arguments, resolve});
            if (working < count) work();
        });
    };
};

function mockRequest() {
    console.log("making request");
    return Promise.delay(Math.random() * 100);
}

var bounced = debounce(mockRequest, 800, 5);
for (var i = 0; i < 5; i++) bounced();
setTimeout(function(){
    for (var i = 0; i < 20; i++) bounced();
},2000);

Popularity 1/10 Helpfulness 1/10 Language javascript

Source: stackoverflow.com

Tags: javascript promise queue timed

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