22 lines
895 B
JavaScript
Executable file
22 lines
895 B
JavaScript
Executable file
'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 speciesConstructor = require('../internals/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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return new (speciesConstructor(O, O.constructor))(
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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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