2 var $ = require('../internals/export');
3 var fails = require('../internals/fails');
4 var ArrayBufferModule = require('../internals/array-buffer');
5 var anObject = require('../internals/an-object');
6 var toAbsoluteIndex = require('../internals/to-absolute-index');
7 var toLength = require('../internals/to-length');
8 var speciesConstructor = require('../internals/species-constructor');
10 var ArrayBuffer = ArrayBufferModule.ArrayBuffer;
11 var DataView = ArrayBufferModule.DataView;
12 var nativeArrayBufferSlice = ArrayBuffer.prototype.slice;
14 var INCORRECT_SLICE = fails(function () {
15 return !new ArrayBuffer(2).slice(1, undefined).byteLength;
18 // `ArrayBuffer.prototype.slice` method
19 // https://tc39.es/ecma262/#sec-arraybuffer.prototype.slice
20 $({ target: 'ArrayBuffer', proto: true, unsafe: true, forced: INCORRECT_SLICE }, {
21 slice: function slice(start, end) {
22 if (nativeArrayBufferSlice !== undefined && end === undefined) {
23 return nativeArrayBufferSlice.call(anObject(this), start); // FF fix
25 var length = anObject(this).byteLength;
26 var first = toAbsoluteIndex(start, length);
27 var fin = toAbsoluteIndex(end === undefined ? length : end, length);
28 var result = new (speciesConstructor(this, ArrayBuffer))(toLength(fin - first));
29 var viewSource = new DataView(this);
30 var viewTarget = new DataView(result);
33 viewTarget.setUint8(index++, viewSource.getUint8(first++));