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17 lines
741 B
17 lines
741 B
'use strict'; |
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var ArrayBufferViewCore = require('../internals/array-buffer-view-core'); |
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var lengthOfArrayLike = require('../internals/length-of-array-like'); |
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var toIntegerOrInfinity = require('../internals/to-integer-or-infinity'); |
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var aTypedArray = ArrayBufferViewCore.aTypedArray; |
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var exportTypedArrayMethod = ArrayBufferViewCore.exportTypedArrayMethod; |
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// `%TypedArray%.prototype.at` method |
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// https://github.com/tc39/proposal-relative-indexing-method |
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exportTypedArrayMethod('at', function at(index) { |
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var O = aTypedArray(this); |
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var len = lengthOfArrayLike(O); |
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var relativeIndex = toIntegerOrInfinity(index); |
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var k = relativeIndex >= 0 ? relativeIndex : len + relativeIndex; |
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return (k < 0 || k >= len) ? undefined : O[k]; |
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});
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