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node_modules/es-abstract/2017/AbstractEqualityComparison.js
| 37 lines
| 1.1 KiB
| application/javascript
| JavascriptLexer
|
| r789 | 'use strict'; | |||
| var ToNumber = require('./ToNumber'); | ||||
| var ToPrimitive = require('./ToPrimitive'); | ||||
| var Type = require('./Type'); | ||||
| // https://www.ecma-international.org/ecma-262/6.0/#sec-abstract-equality-comparison | ||||
| module.exports = function AbstractEqualityComparison(x, y) { | ||||
| var xType = Type(x); | ||||
| var yType = Type(y); | ||||
| if (xType === yType) { | ||||
| return x === y; // ES6+ specified this shortcut anyways. | ||||
| } | ||||
| if (x == null && y == null) { | ||||
| return true; | ||||
| } | ||||
| if (xType === 'Number' && yType === 'String') { | ||||
| return AbstractEqualityComparison(x, ToNumber(y)); | ||||
| } | ||||
| if (xType === 'String' && yType === 'Number') { | ||||
| return AbstractEqualityComparison(ToNumber(x), y); | ||||
| } | ||||
| if (xType === 'Boolean') { | ||||
| return AbstractEqualityComparison(ToNumber(x), y); | ||||
| } | ||||
| if (yType === 'Boolean') { | ||||
| return AbstractEqualityComparison(x, ToNumber(y)); | ||||
| } | ||||
| if ((xType === 'String' || xType === 'Number' || xType === 'Symbol') && yType === 'Object') { | ||||
| return AbstractEqualityComparison(x, ToPrimitive(y)); | ||||
| } | ||||
| if (xType === 'Object' && (yType === 'String' || yType === 'Number' || yType === 'Symbol')) { | ||||
| return AbstractEqualityComparison(ToPrimitive(x), y); | ||||
| } | ||||
| return false; | ||||
| }; | ||||