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- 'use strict';
- var $ = require('../internals/export');
- var toObject = require('../internals/to-object');
- var lengthOfArrayLike = require('../internals/length-of-array-like');
- var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
- var addToUnscopables = require('../internals/add-to-unscopables');
- // `Array.prototype.at` method
- // https://github.com/tc39/proposal-relative-indexing-method
- $({ target: 'Array', proto: true }, {
- at: function at(index) {
- var O = toObject(this);
- var len = lengthOfArrayLike(O);
- var relativeIndex = toIntegerOrInfinity(index);
- var k = relativeIndex >= 0 ? relativeIndex : len + relativeIndex;
- return (k < 0 || k >= len) ? undefined : O[k];
- }
- });
- addToUnscopables('at');
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