23 lines
923 B
JavaScript
23 lines
923 B
JavaScript
'use strict';
|
|
var ArrayBufferViewCore = require('../internals/array-buffer-view-core');
|
|
var toLength = require('../internals/to-length');
|
|
var toAbsoluteIndex = require('../internals/to-absolute-index');
|
|
var typedArraySpeciesConstructor = require('../internals/typed-array-species-constructor');
|
|
|
|
var aTypedArray = ArrayBufferViewCore.aTypedArray;
|
|
var exportTypedArrayMethod = ArrayBufferViewCore.exportTypedArrayMethod;
|
|
|
|
// `%TypedArray%.prototype.subarray` method
|
|
// https://tc39.es/ecma262/#sec-%typedarray%.prototype.subarray
|
|
exportTypedArrayMethod('subarray', function subarray(begin, end) {
|
|
var O = aTypedArray(this);
|
|
var length = O.length;
|
|
var beginIndex = toAbsoluteIndex(begin, length);
|
|
var C = typedArraySpeciesConstructor(O);
|
|
return new C(
|
|
O.buffer,
|
|
O.byteOffset + beginIndex * O.BYTES_PER_ELEMENT,
|
|
toLength((end === undefined ? length : toAbsoluteIndex(end, length)) - beginIndex)
|
|
);
|
|
});
|
