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reduce.js.html
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<title>JSDoc: Source: reduce.js</title>
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<h1 class="page-title">Source: reduce.js</h1>
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<article>
<pre class="prettyprint source linenums"><code>'use strict';
const { promisifyClosure } = require('./utils/promisify');
/**The reduce() method reduces the array to a single value.
* The reduce() method executes a provided function for each
* value of the array (from left-to-right). The return value
* of the function is stored in an accumulator (result/total).
* @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.acc - accumulator.
* @param {any} fn.item - current value.
* @param {Function} fn.callback - The callback function
* in which the processed value is passed,
* if fn function with callback contract.
* @param {any} startValue - your starting value,
* otherwise it's 0.
* @param {Array} arr - array of values.
* @param {Object} config - object with settings
* for a function
* @property {Boolean} confing.isCb -
* function accepts callback.
* @example
reduce((acc, item, callback) => {
setTimeout(() => callback(null, acc + item), 1000);
}, 10, [1, 2, 3, 4, 5, 6], { isCb: true })
.then(res => console.log(res))
.catch(err => console.log(err.message));
* @returns {any} result of calculations
*/
const reduce = (fn, startValue, arr = [], config = {}) => (
new Promise(resolve => {
const { isCb } = config;
const len = arr.length;
let i = 0, acc = startValue, wrappedFn = fn;
if (isCb)
wrappedFn = promisifyClosure(fn);
const iterate = async () => {
if (i === len) resolve(acc);
else {
acc = await wrappedFn(acc, arr[i]);
i++;
iterate();
}
};
iterate();
})
);
module.exports = reduce;
</code></pre>
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<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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