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59 lines
1.7 KiB
59 lines
1.7 KiB
'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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