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33 lines
1.3 KiB
JavaScript
33 lines
1.3 KiB
JavaScript
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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 -- NaN check
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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 -- NaN check
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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.es/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.es/ecma262/#sec-array.prototype.indexof
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indexOf: createMethod(false)
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};
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