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map.js.html
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<!DOCTYPE html>
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<meta charset="utf-8">
<title>JSDoc: Source: map.js</title>
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<h1 class="page-title">Source: map.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>'use strict';
const { promisifyClosure } = require('./utils/promisify');
/**
* Applies the function fn to each argument
* and returns an array of
* values that the function returned.
* @param {Function} fn - A function
* (with a callback or promise contract)
* that takes each argument
* as input and returns the processed value.
* @param {any} fn.item - current value.
* @param {any} fn.itemInde - index of the currently
* processed element in the array.
* @param {any} fn.callback - The callback function
* in which the processed value is passed,
* if fn function with callback contract.
* @param {Array} arr - array of values.
* @param {Object} config - object with settings
* for a function
* @property {Boolean} confing.isCb -
* function accepts callback.
*
* @example
*
* const arr = [1, 2, 3, 5];
map((item, cb) => {
setTimeout(() => {
cb(null, item + 2);
}, 10);
}, arr, { isCb: true })
.then(data => console.log(data))
.catch(err => console.log(err.message));
*
* @returns {Array} an array of processed
* values or an error
*/
const map = async (fn, arr = [], config = {}) => {
if (!Array.isArray(arr))
throw new Error('The first argument must be an array');
const { parallel, isCb } = config;
const wrappedFn = isCb ?
promisifyClosure(fn, (err, data) => data) : fn;
if (parallel && !isCb) {
const result = await Promise.all(arr.map(wrappedFn));
return result;
}
const result = [];
for (const item of arr) result.push(await wrappedFn(item));
return result;
};
module.exports = map;
</code></pre>
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<nav>
<h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><li><a href="AsyncEmitter.html">AsyncEmitter</a></li></ul><h3>Global</h3><ul><li><a href="index.html#asyncMemoize">asyncMemoize</a></li><li><a href="index.html#map">map</a></li><li><a href="index.html#Queue">Queue</a></li><li><a href="index.html#queue">queue</a></li><li><a href="index.html#reduce">reduce</a></li><li><a href="index.html#retry">retry</a></li><li><a href="index.html#series">series</a></li><li><a href="index.html#some">some</a></li></ul>
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Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 3.6.6</a> on Mon Jan 04 2021 15:21:06 GMT+0200 (GMT+02:00)
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