main
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Last change
on this file since d565449 was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago |
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Update repo after prototype presentation
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Property mode
set to
100644
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File size:
1.1 KB
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| 1 | 'use strict';
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| 2 |
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| 3 | var ToNumber = require('./ToNumber');
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| 4 | var ToPrimitive = require('./ToPrimitive');
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| 5 | var Type = require('./Type');
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| 6 |
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| 7 | // https://262.ecma-international.org/6.0/#sec-abstract-equality-comparison
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| 8 |
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| 9 | module.exports = function AbstractEqualityComparison(x, y) {
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| 10 | var xType = Type(x);
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| 11 | var yType = Type(y);
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| 12 | if (xType === yType) {
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| 13 | return x === y; // ES6+ specified this shortcut anyways.
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| 14 | }
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| 15 | if (x == null && y == null) {
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| 16 | return true;
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| 17 | }
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| 18 | if (xType === 'Number' && yType === 'String') {
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| 19 | return AbstractEqualityComparison(x, ToNumber(y));
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| 20 | }
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| 21 | if (xType === 'String' && yType === 'Number') {
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| 22 | return AbstractEqualityComparison(ToNumber(x), y);
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| 23 | }
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| 24 | if (xType === 'Boolean') {
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| 25 | return AbstractEqualityComparison(ToNumber(x), y);
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| 26 | }
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| 27 | if (yType === 'Boolean') {
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| 28 | return AbstractEqualityComparison(x, ToNumber(y));
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| 29 | }
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| 30 | if ((xType === 'String' || xType === 'Number' || xType === 'Symbol') && yType === 'Object') {
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| 31 | return AbstractEqualityComparison(x, ToPrimitive(y));
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| 32 | }
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| 33 | if (xType === 'Object' && (yType === 'String' || yType === 'Number' || yType === 'Symbol')) {
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| 34 | return AbstractEqualityComparison(ToPrimitive(x), y);
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| 35 | }
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| 36 | return false;
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| 37 | };
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