38 lines
1.1 KiB
JavaScript
38 lines
1.1 KiB
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var ToNumber = require('./ToNumber');
|
||
|
|
var ToPrimitive = require('./ToPrimitive');
|
||
|
|
var Type = require('./Type');
|
||
|
|
|
||
|
|
var isObject = require('../helpers/isObject');
|
||
|
|
|
||
|
|
// https://262.ecma-international.org/5.1/#sec-11.9.3
|
||
|
|
|
||
|
|
module.exports = function AbstractEqualityComparison(x, y) {
|
||
|
|
if (Type(x) === Type(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') && isObject(y)) {
|
||
|
|
return AbstractEqualityComparison(x, ToPrimitive(y));
|
||
|
|
}
|
||
|
|
if (isObject(x) && (typeof y === 'string' || typeof y === 'number')) {
|
||
|
|
return AbstractEqualityComparison(ToPrimitive(x), y);
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
};
|