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- 'use strict';
- var $ = require('../internals/export');
- var uncurryThis = require('../internals/function-uncurry-this-clause');
- var fails = require('../internals/fails');
- var ArrayBufferModule = require('../internals/array-buffer');
- var anObject = require('../internals/an-object');
- var toAbsoluteIndex = require('../internals/to-absolute-index');
- var toLength = require('../internals/to-length');
- var speciesConstructor = require('../internals/species-constructor');
-
- var ArrayBuffer = ArrayBufferModule.ArrayBuffer;
- var DataView = ArrayBufferModule.DataView;
- var DataViewPrototype = DataView.prototype;
- var nativeArrayBufferSlice = uncurryThis(ArrayBuffer.prototype.slice);
- var getUint8 = uncurryThis(DataViewPrototype.getUint8);
- var setUint8 = uncurryThis(DataViewPrototype.setUint8);
-
- var INCORRECT_SLICE = fails(function () {
- return !new ArrayBuffer(2).slice(1, undefined).byteLength;
- });
-
- // `ArrayBuffer.prototype.slice` method
- // https://tc39.es/ecma262/#sec-arraybuffer.prototype.slice
- $({ target: 'ArrayBuffer', proto: true, unsafe: true, forced: INCORRECT_SLICE }, {
- slice: function slice(start, end) {
- if (nativeArrayBufferSlice && end === undefined) {
- return nativeArrayBufferSlice(anObject(this), start); // FF fix
- }
- var length = anObject(this).byteLength;
- var first = toAbsoluteIndex(start, length);
- var fin = toAbsoluteIndex(end === undefined ? length : end, length);
- var result = new (speciesConstructor(this, ArrayBuffer))(toLength(fin - first));
- var viewSource = new DataView(this);
- var viewTarget = new DataView(result);
- var index = 0;
- while (first < fin) {
- setUint8(viewTarget, index++, getUint8(viewSource, first++));
- } return result;
- }
- });
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