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Dir : ~/usr/share/nodejs/core-js/modules/

View File Name : es.typed-array.at.js

'use strict';
var ArrayBufferViewCore = require('../internals/array-buffer-view-core');
var lengthOfArrayLike = require('../internals/length-of-array-like');
var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');

var aTypedArray = ArrayBufferViewCore.aTypedArray;
var exportTypedArrayMethod = ArrayBufferViewCore.exportTypedArrayMethod;

// `%TypedArray%.prototype.at` method
// https://github.com/tc39/proposal-relative-indexing-method
exportTypedArrayMethod('at', function at(index) {
  var O = aTypedArray(this);
  var len = lengthOfArrayLike(O);
  var relativeIndex = toIntegerOrInfinity(index);
  var k = relativeIndex >= 0 ? relativeIndex : len + relativeIndex;
  return (k < 0 || k >= len) ? undefined : O[k];
});