IsLooselyEqual.js
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'use strict';
var isFinite = require('../helpers/isFinite');
var isNaN = require('../helpers/isNaN');
var IsStrictlyEqual = require('./IsStrictlyEqual');
var StringToBigInt = require('./StringToBigInt');
var ToNumber = require('./ToNumber');
var ToPrimitive = require('./ToPrimitive');
var Type = require('./Type');
// https://262.ecma-international.org/13.0/#sec-islooselyequal
module.exports = function IsLooselyEqual(x, y) {
var xType = Type(x);
var yType = Type(y);
if (xType === yType) {
return IsStrictlyEqual(x, y);
}
if (x == null && y == null) {
return true;
}
if (xType === 'Number' && yType === 'String') {
return IsLooselyEqual(x, ToNumber(y));
}
if (xType === 'String' && yType === 'Number') {
return IsLooselyEqual(ToNumber(x), y);
}
if (xType === 'BigInt' && yType === 'String') {
var n = StringToBigInt(y);
if (isNaN(n)) {
return false;
}
return IsLooselyEqual(x, n);
}
if (xType === 'String' && yType === 'BigInt') {
return IsLooselyEqual(y, x);
}
if (xType === 'Boolean') {
return IsLooselyEqual(ToNumber(x), y);
}
if (yType === 'Boolean') {
return IsLooselyEqual(x, ToNumber(y));
}
if ((xType === 'String' || xType === 'Number' || xType === 'Symbol' || xType === 'BigInt') && yType === 'Object') {
return IsLooselyEqual(x, ToPrimitive(y));
}
if (xType === 'Object' && (yType === 'String' || yType === 'Number' || yType === 'Symbol' || yType === 'BigInt')) {
return IsLooselyEqual(ToPrimitive(x), y);
}
if ((xType === 'BigInt' && yType === 'Number') || (xType === 'Number' && yType === 'BigInt')) {
if (!isFinite(x) || !isFinite(y)) {
return false;
}
// eslint-disable-next-line eqeqeq
return x == y; // shortcut for step 13.b.
}
return false;
};