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index.js
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index.js
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'use strict';
/**
* Make sure that iteratee[n] will be invoked after min time(ms) from the iteratee[n - 1] invoking.
* @param {number} time (ms)
* @param {function} iteratee
*
* @example
* const DelayIteratee = require('delay-iteratee');
*
* const start_at = Date.now();
* const coll = ['A', 'B', 'C', 'D', 'E', 'F'];
* const iteratee = async item => console.log(`at ${Date.now() - start_at}ms ${item}`);
*
* Promise.all(coll.map(DelayIteratee(200, iteratee)));
*
* // or
* const asyncLib = require('async');
* asyncLib.eachLimit(coll, 3, DelayIteratee(200, iteratee));
*
* // will print like:
* at 0ms A
* at 200ms B
* at 400ms C
* at 600ms D
* at 800ms E
* at 1000ms F
*/
function DelayIteratee(time, iteratee) {
let start_at;
let i = 0;
return async function delayIteratee(...args) {
if (!start_at) { start_at = Date.now() }
let timeout = Math.max((i * time) - (Date.now() - start_at), 0);
i++;
if (timeout > 0) {
await delay(timeout);
}
return iteratee(...args);
}
}
/**
* Delay after ms
* @param {number} ms
*
* @example
* const { delay } = require('delay-iteratee');
* doSomething();
* await delay(200);
* doSomethingElse();
*/
function delay(ms) {
return new Promise(resolve => {
setTimeout(resolve, ms);
})
}
module.exports = DelayIteratee;
module.exports.delay = delay;