2 var ArrayBufferViewCore = require('../internals/array-buffer-view-core');
3 var toLength = require('../internals/to-length');
4 var toInteger = require('../internals/to-integer');
6 var aTypedArray = ArrayBufferViewCore.aTypedArray;
7 var exportTypedArrayMethod = ArrayBufferViewCore.exportTypedArrayMethod;
9 // `%TypedArray%.prototype.at` method
10 // https://github.com/tc39/proposal-relative-indexing-method
11 exportTypedArrayMethod('at', function at(index) {
12 var O = aTypedArray(this);
13 var len = toLength(O.length);
14 var relativeIndex = toInteger(index);
15 var k = relativeIndex >= 0 ? relativeIndex : len + relativeIndex;
16 return (k < 0 || k >= len) ? undefined : O[k];