monad-ts
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Monad-ts is a small library implements some of key monads and way to chain them in a pipe (flow) in JavaScript and TypeScript. Angular 2+ compatible.
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<div class="content" data-ice="content"><h1 data-ice="title">src/services/cast.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">/**
* Decreasing the dimension of an array by n.
* @method cast
* @param {any} arr - input array.
* @param {number} n - decreasing factor.
* @return {Array<any>|T[]|Error}
*/
export function cast(arr, n = 0) {
return typeof n === 'number' && Array.isArray(arr)
? n > 0 ? _reduser(arr, n) : arr
: new Error('Function cast. Input must be array and factor - number.');
}
/**
* @method _reduser
* @param {Array<T>} arr - input array.
* @param {number} n - decreasing factor.
* @return {Array<any>}
* @private
*/
function _reduser(arr, n) {
return arr.length
? arr.reduce((acc, vL) => {
return acc.concat(_fact(vL, n));
}, [])
: arr;
}
/**
* @method _fact
* @param {Array<any>} arr - input array.
* @param {number} n - decreasing factor.
* @return {Array<any>}
* @private
*/
function _fact(arr, n) {
return (n === 1) ? arr : _reduser(arr, n - 1);
}
//Copyright (c) 2017 Alex Tranchenko. All rights reserved.
</code></pre>
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