24 lines
924 B
JavaScript
24 lines
924 B
JavaScript
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// false -> Array#indexOf
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// true -> Array#includes
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var toIObject = require('./_to-iobject');
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var toLength = require('./_to-length');
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var toAbsoluteIndex = require('./_to-absolute-index');
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module.exports = function (IS_INCLUDES) {
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return function ($this, el, fromIndex) {
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var O = toIObject($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++) if (IS_INCLUDES || index in O) {
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if (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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