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