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Tim van der Lippefdbd42e2020-04-07 14:14:361'use strict';
2
3var ToNumber = require('./ToNumber');
4var ToPrimitive = require('./ToPrimitive');
5var Type = require('./Type');
6
Nikolay Vitkovd76576c2024-12-02 14:10:157// https://262.ecma-international.org/6.0/#sec-abstract-equality-comparison
Tim van der Lippefdbd42e2020-04-07 14:14:368
9module.exports = function AbstractEqualityComparison(x, y) {
10 var xType = Type(x);
11 var yType = Type(y);
12 if (xType === yType) {
13 return x === y; // ES6+ specified this shortcut anyways.
14 }
15 if (x == null && y == null) {
16 return true;
17 }
18 if (xType === 'Number' && yType === 'String') {
19 return AbstractEqualityComparison(x, ToNumber(y));
20 }
21 if (xType === 'String' && yType === 'Number') {
22 return AbstractEqualityComparison(ToNumber(x), y);
23 }
24 if (xType === 'Boolean') {
25 return AbstractEqualityComparison(ToNumber(x), y);
26 }
27 if (yType === 'Boolean') {
28 return AbstractEqualityComparison(x, ToNumber(y));
29 }
30 if ((xType === 'String' || xType === 'Number' || xType === 'Symbol') && yType === 'Object') {
31 return AbstractEqualityComparison(x, ToPrimitive(y));
32 }
33 if (xType === 'Object' && (yType === 'String' || yType === 'Number' || yType === 'Symbol')) {
34 return AbstractEqualityComparison(ToPrimitive(x), y);
35 }
36 return false;
37};