126 lines
2.9 KiB
JavaScript
Executable File
126 lines
2.9 KiB
JavaScript
Executable File
"use strict";
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/** @module helpers */
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require('es6-shim');
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/** @alias module:helpers */
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var h = {
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/**
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* Wrap String.prototype.trim in a way that is easily mappable
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*
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* @param {String} str - The string to trim
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* @return {String} - The trimmed string
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*/
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stringTrim: function(str) {
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return str.trim();
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},
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/**
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* Get the type of the variable passed
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*
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* @see https://techblog.badoo.com/blog/2013/11/01/type-checking-in-javascript/
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* @see http://toddmotto.com/understanding-javascript-types-and-reliable-type-checking/
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* @param {mixed} o
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* @return {String}
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*/
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type: function (o) {
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var type = Object.prototype.toString.call(o).slice(8, -1).toLowerCase();
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// handle NaN and Infinity
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if (type === 'number') {
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if (isNaN(o)) {
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return 'nan';
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}
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if (!isFinite(o)) {
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return 'infinity';
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}
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}
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return type;
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},
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/**
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* Determine whether an object is scalar
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*
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* @param {mixed} obj
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* @return {bool}
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*/
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isScalar: function(obj) {
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var scalar = ['string', 'number', 'boolean'];
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return scalar.indexOf(h.type(obj)) !== -1;
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},
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/**
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* Get a list of values with a common key from an array of objects
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*
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* @param {Array} arr - The array of objects to search
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* @param {String} key - The key of the object to get
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* @return {Array}
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*/
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arrayPluck: function(arr, key) {
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var output = [];
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// Empty case
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if (arr.length === 0) return output;
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arr.forEach(function(obj) {
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if ( ! h.isUndefined(obj[key]))
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{
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output.push(obj[key]);
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}
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});
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return output;
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},
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/**
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* Determine if a value matching the passed regular expression is
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* in the passed array
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*
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* @param {Array} arr - The array to search
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* @param {RegExp} pattern - The pattern to match
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* @return {Boolean} - If an array item matches the pattern
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*/
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regexInArray: function(arr, pattern) {
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// Empty case(s)
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if ( ! h.isArray(arr)) return false;
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if (arr.length === 0) return false;
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var i, l = arr.length;
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for(i=0; i< l; i++)
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{
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// Recurse for nested arrays
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if (Array.isArray(arr[i]))
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{
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return h.regexInArray(arr[i], pattern);
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}
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// Short circuit if any items match
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if (pattern.test(arr[i])) return true;
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}
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return false;
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}
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};
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// Define an 'is' method for each type
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var types = ['Null','Undefined','Object','Array','String','Number','Boolean','Function','RegExp','NaN','Infinite'];
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types.forEach(function (t) {
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/**
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* Determine whether a variable is of the type specified in the
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* function name, eg isNumber
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*
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* Types available are Null, Undefined, Object, Array, String, Number, Boolean, Function, RegExp, NaN and Infinite
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*
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* @name is[type]
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* @param {mixed} o
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* @return {Boolean}
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*/
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h['is' + t] = function (o) {
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if (t.toLowerCase() === 'infinite')
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{
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t = 'infinity';
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}
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return h.type(o) === t.toLowerCase();
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};
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});
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module.exports = h; |