38 lines
1.2 KiB
JavaScript
38 lines
1.2 KiB
JavaScript
'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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var isObject = require('../helpers/isObject');
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// https://262.ecma-international.org/6.0/#sec-abstract-equality-comparison
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module.exports = function AbstractEqualityComparison(x, y) {
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if (Type(x) === Type(y)) {
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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 (typeof x === 'number' && typeof y === 'string') {
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return AbstractEqualityComparison(x, ToNumber(y));
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}
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if (typeof x === 'string' && typeof y === 'number') {
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return AbstractEqualityComparison(ToNumber(x), y);
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}
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if (typeof x === 'boolean') {
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return AbstractEqualityComparison(ToNumber(x), y);
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}
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if (typeof y === 'boolean') {
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return AbstractEqualityComparison(x, ToNumber(y));
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}
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if ((typeof x === 'string' || typeof x === 'number' || typeof x === 'symbol') && isObject(y)) {
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return AbstractEqualityComparison(x, ToPrimitive(y));
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}
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if (isObject(x) && (typeof y === 'string' || typeof y === 'number' || typeof y === '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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