36 lines
1.2 KiB
JavaScript
36 lines
1.2 KiB
JavaScript
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'use strict';
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var ToInteger = require('es-abstract/2018/ToInteger');
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var ToLength = require('es-abstract/2018/ToLength');
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var ToObject = require('es-abstract/2018/ToObject');
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var SameValueZero = require('es-abstract/2018/SameValueZero');
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var $isNaN = require('es-abstract/helpers/isNaN');
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var $isFinite = require('es-abstract/helpers/isFinite');
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var GetIntrinsic = require('es-abstract/GetIntrinsic');
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var callBound = require('es-abstract/helpers/callBound');
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var isString = require('is-string');
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var $charAt = callBound('String.prototype.charAt');
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var $indexOf = GetIntrinsic('%Array.prototype.indexOf%'); // TODO: use callBind.apply without breaking IE 8
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module.exports = function includes(searchElement) {
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var fromIndex = arguments.length > 1 ? ToInteger(arguments[1]) : 0;
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if ($indexOf && !$isNaN(searchElement) && $isFinite(fromIndex) && typeof searchElement !== 'undefined') {
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return $indexOf.apply(this, arguments) > -1;
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}
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var O = ToObject(this);
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var length = ToLength(O.length);
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if (length === 0) {
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return false;
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}
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var k = fromIndex >= 0 ? fromIndex : Math.max(0, length + fromIndex);
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while (k < length) {
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if (SameValueZero(searchElement, isString(O) ? $charAt(O, k) : O[k])) {
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return true;
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}
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k += 1;
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}
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return false;
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};
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