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authorGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
committerGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
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+'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;
+};