2 var $ = require('../internals/export');
3 var uncurryThis = require('../internals/function-uncurry-this');
4 var fails = require('../internals/fails');
5 var ArrayBufferModule = require('../internals/array-buffer');
6 var anObject = require('../internals/an-object');
7 var toAbsoluteIndex = require('../internals/to-absolute-index');
8 var toLength = require('../internals/to-length');
9 var speciesConstructor = require('../internals/species-constructor');
11 var ArrayBuffer = ArrayBufferModule.ArrayBuffer;
12 var DataView = ArrayBufferModule.DataView;
13 var DataViewPrototype = DataView.prototype;
14 var un$ArrayBufferSlice = uncurryThis(ArrayBuffer.prototype.slice);
15 var getUint8 = uncurryThis(DataViewPrototype.getUint8);
16 var setUint8 = uncurryThis(DataViewPrototype.setUint8);
18 var INCORRECT_SLICE = fails(function () {
19 return !new ArrayBuffer(2).slice(1, undefined).byteLength;
22 // `ArrayBuffer.prototype.slice` method
23 // https://tc39.es/ecma262/#sec-arraybuffer.prototype.slice
24 $({ target: 'ArrayBuffer', proto: true, unsafe: true, forced: INCORRECT_SLICE }, {
25 slice: function slice(start, end) {
26 if (un$ArrayBufferSlice && end === undefined) {
27 return un$ArrayBufferSlice(anObject(this), start); // FF fix
29 var length = anObject(this).byteLength;
30 var first = toAbsoluteIndex(start, length);
31 var fin = toAbsoluteIndex(end === undefined ? length : end, length);
32 var result = new (speciesConstructor(this, ArrayBuffer))(toLength(fin - first));
33 var viewSource = new DataView(this);
34 var viewTarget = new DataView(result);
37 setUint8(viewTarget, index++, getUint8(viewSource, first++));