AbstractEqualityComparison.jsā¢1.2 kB
'use strict';
var ToNumber = require('./ToNumber');
var ToPrimitive = require('./ToPrimitive');
var isSameType = require('../helpers/isSameType');
var isObject = require('es-object-atoms/isObject');
// https://262.ecma-international.org/6.0/#sec-abstract-equality-comparison
module.exports = function AbstractEqualityComparison(x, y) {
if (isSameType(x, y)) {
return x === y; // ES6+ specified this shortcut anyways.
}
if (x == null && y == null) {
return true;
}
if (typeof x === 'number' && typeof y === 'string') {
return AbstractEqualityComparison(x, ToNumber(y));
}
if (typeof x === 'string' && typeof y === 'number') {
return AbstractEqualityComparison(ToNumber(x), y);
}
if (typeof x === 'boolean') {
return AbstractEqualityComparison(ToNumber(x), y);
}
if (typeof y === 'boolean') {
return AbstractEqualityComparison(x, ToNumber(y));
}
if ((typeof x === 'string' || typeof x === 'number' || typeof x === 'symbol') && isObject(y)) {
return AbstractEqualityComparison(x, ToPrimitive(y));
}
if (isObject(x) && (typeof y === 'string' || typeof y === 'number' || typeof y === 'symbol')) {
return AbstractEqualityComparison(ToPrimitive(x), y);
}
return false;
};