21 lines
733 B
JavaScript
21 lines
733 B
JavaScript
'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://tc39.es/ecma262/#sec-array.prototype.at
|
|
$({ 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');
|