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index.js
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index.js
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(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
(global.arrayBack = factory());
}(this, (function () { 'use strict';
/**
* Takes any input and guarantees an array back.
*
* - converts array-like objects (e.g. `arguments`) to a real array
* - converts `undefined` to an empty array
* - converts any another other, singular value (including `null`) into an array containing that value
* - ignores input which is already an array
*
* @module array-back
* @example
* > const arrayify = require('array-back')
*
* > arrayify(undefined)
* []
*
* > arrayify(null)
* [ null ]
*
* > arrayify(0)
* [ 0 ]
*
* > arrayify([ 1, 2 ])
* [ 1, 2 ]
*
* > function f(){ return arrayify(arguments); }
* > f(1,2,3)
* [ 1, 2, 3 ]
*/
function isObject (input) {
return typeof input === 'object' && input !== null
}
function isArrayLike (input) {
return isObject(input) && typeof input.length === 'number'
}
/**
* @param {*} - the input value to convert to an array
* @returns {Array}
* @alias module:array-back
*/
function arrayify (input) {
if (Array.isArray(input)) {
return input
} else {
if (input === undefined) {
return []
} else if (isArrayLike(input)) {
return Array.prototype.slice.call(input)
} else {
return [ input ]
}
}
}
return arrayify;
})));