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32 lines
1.3 KiB
32 lines
1.3 KiB
var toIndexedObject = require('../internals/to-indexed-object'); |
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var toLength = require('../internals/to-length'); |
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var toAbsoluteIndex = require('../internals/to-absolute-index'); |
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// `Array.prototype.{ indexOf, includes }` methods implementation |
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var createMethod = function (IS_INCLUDES) { |
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return function ($this, el, fromIndex) { |
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var O = toIndexedObject($this); |
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var length = toLength(O.length); |
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var index = toAbsoluteIndex(fromIndex, length); |
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var value; |
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// Array#includes uses SameValueZero equality algorithm |
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// eslint-disable-next-line no-self-compare |
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if (IS_INCLUDES && el != el) while (length > index) { |
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value = O[index++]; |
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// eslint-disable-next-line no-self-compare |
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if (value != value) return true; |
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// Array#indexOf ignores holes, Array#includes - not |
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} else for (;length > index; index++) { |
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if ((IS_INCLUDES || index in O) && O[index] === el) return IS_INCLUDES || index || 0; |
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} return !IS_INCLUDES && -1; |
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}; |
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}; |
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module.exports = { |
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// `Array.prototype.includes` method |
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// https://tc39.github.io/ecma262/#sec-array.prototype.includes |
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includes: createMethod(true), |
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// `Array.prototype.indexOf` method |
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// https://tc39.github.io/ecma262/#sec-array.prototype.indexof |
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indexOf: createMethod(false) |
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};
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