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/*! |
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* utilities.js | v0.7.0 | Utility functions for front-end JavaScript development |
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* Copyright (c) 2017 Eric Zieger (MIT license) |
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* https://github.com/theZieger/utilitiesjs/blob/master/LICENSE |
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*/ |
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(function(root, factory) { |
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/** global: define */ |
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if (typeof define === "function" && define.amd) { |
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define(["utilities"], factory); |
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/** global: module */ |
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} else if (typeof module === "object" && module.exports) { |
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module.exports = factory(); |
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} else { |
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root.utilities = factory(); |
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} |
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}(this, function(undefined) { |
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/** |
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* inherit the prototype of the SuperConstructor |
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* |
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* Warning: Changing the prototype of an object is, by the nature of how modern JavaScript engines |
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* optimize property accesses, a very slow operation, in every browser and JavaScript engine. |
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* So instead of using Object.setPrototypeOf or messing with __proto__, we create a new object |
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* with the desired prototype using Object.create(). |
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* |
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* @see https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf |
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* |
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* @param {Object} Constructor |
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* @param {Object} SuperConstructor |
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* |
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* @throws {TypeError} if arguments are null/undefined, or SuperConstructor has no prototype |
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* |
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* @returns {Void} |
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*/ |
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var inherits = function(Constructor, SuperConstructor) { |
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if (Constructor === undefined || Constructor === null) { |
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throw new TypeError('Constructor argument is undefined or null'); |
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} |
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if (SuperConstructor === undefined || SuperConstructor === null) { |
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throw new TypeError('SuperConstructor argument is undefined or null'); |
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} |
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if (SuperConstructor.prototype === undefined) { |
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throw new TypeError('SuperConstructor.prototype is undefined'); |
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} |
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// for convenience, SuperConstructor will be accessible through the Constructor.super_ property |
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Constructor.super_ = SuperConstructor; |
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Constructor.prototype = Object.create(SuperConstructor.prototype); |
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Constructor.prototype.constructor = Constructor; |
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}; |
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/** |
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* Turns Array (of Objects) into associative Object (by given mapBy when given) |
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* |
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* @param {Array} arr |
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* @param {String} mapBy optional mapping key |
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* |
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* @throws {TypeError} if arr is not an Array or mapBy is set but not a String |
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* |
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* @returns {Object} |
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*/ |
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var toObject = function(arr, mapBy) { |
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var obj = {}; |
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if (!Array.isArray(arr)) { |
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throw new TypeError('arr argument is not of type Array'); |
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} |
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if (typeof mapBy !== 'string' && mapBy != null) { |
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throw new TypeError('mapBy argument is not of type String'); |
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} |
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arr.forEach(function(val, i) { |
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if (!mapBy) { |
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obj[i] = val; |
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} else if ( |
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typeof val[mapBy] === 'string' |
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|| typeof val[mapBy] === 'number' |
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) { |
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obj[val[mapBy]] = val; |
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} |
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}); |
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return obj; |
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}; |
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return { |
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inherits: inherits, |
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toObject: toObject |
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}; |
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})); |
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theZieger /
utilitiesjs
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