Spaces:
Configuration error
Configuration error
| ; | |
| var ToNumber = require('./ToNumber'); | |
| var ToPrimitive = require('./ToPrimitive'); | |
| var Type = require('./Type'); | |
| // https://262.ecma-international.org/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; | |
| }; | |