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Viewing file:     AbstractEqualityComparison.js (1.06 KB)      -rw-r--r--

'use strict';

var ToNumber = require('./ToNumber');
var ToPrimitive = require('./ToPrimitive');
var Type = require('./Type');

// https://262.ecma-international.org/5.1/#sec-11.9.3

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') && yType === 'Object') {
		return AbstractEqualityComparison(x, ToPrimitive(y));
	}
	if (xType === 'Object' && (yType === 'String' || yType === 'Number')) {
		return AbstractEqualityComparison(ToPrimitive(x), y);
	}
	return false;
};