--- /dev/null
+'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');