node-query/lib/helpers.js

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"use strict";
/** @module helpers */
require('es6-shim');
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/** @alias module:helpers */
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var h = {
/**
* Wrap String.prototype.trim in a way that is easily mappable
*
* @param {String} str - The string to trim
* @return {String} - The trimmed string
*/
stringTrim: function(str) {
return str.trim();
},
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/**
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* Get the type of the variable passed
*
* @see https://techblog.badoo.com/blog/2013/11/01/type-checking-in-javascript/
* @see http://toddmotto.com/understanding-javascript-types-and-reliable-type-checking/
* @param {mixed} o
* @return {String}
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*/
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type: function (o) {
var type = Object.prototype.toString.call(o).slice(8, -1).toLowerCase();
// handle NaN and Infinity
if (type === 'number') {
if (isNaN(o)) {
return 'nan';
}
if (!isFinite(o)) {
return 'infinity';
}
}
return type;
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},
/**
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* Determine whether an object is scalar
*
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* @param {mixed} obj
* @return {bool}
*/
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isScalar: function(obj) {
var scalar = ['string', 'number', 'boolean'];
return scalar.indexOf(h.type(obj)) !== -1;
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}
};
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// Define an 'is' method for each type
var types = ['Null','Undefined','Object','Array','String','Number','Boolean','Function','RegExp','NaN','Infinite'];
types.forEach(function (t) {
/**
* Determine whether a variable is of the type specified in the
* function name, eg isNumber
*
* Types available are Null, Undefined, Object, Array, String, Number, Boolean, Function, RegExp, NaN and Infinite
*
* @name is[type]
* @param {mixed} o
* @return {Boolean}
*/
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h['is' + t] = function (o) {
if (t.toLowerCase() === 'infinite')
{
t = 'infinity';
}
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return h.type(o) === t.toLowerCase();
};
});
module.exports = h;