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