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