es.typed-array.subarray.js
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es.typed-array.subarray.js
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	'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)
	);
	});