Last change
on this file since 8d391a1 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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1 | 'use strict';
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2 | var ArrayBufferViewCore = require('../internals/array-buffer-view-core');
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3 | var toLength = require('../internals/to-length');
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4 | var toAbsoluteIndex = require('../internals/to-absolute-index');
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5 | var typedArraySpeciesConstructor = require('../internals/typed-array-species-constructor');
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6 |
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7 | var aTypedArray = ArrayBufferViewCore.aTypedArray;
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8 | var exportTypedArrayMethod = ArrayBufferViewCore.exportTypedArrayMethod;
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9 |
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10 | // `%TypedArray%.prototype.subarray` method
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11 | // https://tc39.es/ecma262/#sec-%typedarray%.prototype.subarray
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12 | exportTypedArrayMethod('subarray', function subarray(begin, end) {
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13 | var O = aTypedArray(this);
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14 | var length = O.length;
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15 | var beginIndex = toAbsoluteIndex(begin, length);
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16 | var C = typedArraySpeciesConstructor(O);
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17 | return new C(
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18 | O.buffer,
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19 | O.byteOffset + beginIndex * O.BYTES_PER_ELEMENT,
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20 | toLength((end === undefined ? length : toAbsoluteIndex(end, length)) - beginIndex)
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21 | );
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22 | });
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