44 lines
1.4 KiB
JavaScript
44 lines
1.4 KiB
JavaScript
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'use strict';
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var $TypeError = require('es-errors/type');
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var IsDetachedBuffer = require('./IsDetachedBuffer');
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var IsIntegralNumber = require('./IsIntegralNumber');
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var IsTypedArrayOutOfBounds = require('./IsTypedArrayOutOfBounds');
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var MakeTypedArrayWithBufferWitnessRecord = require('./MakeTypedArrayWithBufferWitnessRecord');
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var TypedArrayLength = require('./TypedArrayLength');
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var isNegativeZero = require('../helpers/isNegativeZero');
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var isTypedArray = require('is-typed-array');
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var typedArrayBuffer = require('typed-array-buffer');
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// https://262.ecma-international.org/15.0/#sec-isvalidintegerindex
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module.exports = function IsValidIntegerIndex(O, index) {
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if (!isTypedArray(O)) {
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throw new $TypeError('Assertion failed: `O` is not a TypedArray object');
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}
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if (typeof index !== 'number') {
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throw new $TypeError('Assertion failed: `index` is not a Number');
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}
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var buffer = typedArrayBuffer(O);
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if (IsDetachedBuffer(buffer)) { return false; } // step 1
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if (!IsIntegralNumber(index)) { return false; } // step 2
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if (isNegativeZero(index)) { return false; } // step 3
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var taRecord = MakeTypedArrayWithBufferWitnessRecord(O, 'UNORDERED'); // step 4
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if (IsTypedArrayOutOfBounds(taRecord)) {
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return false; // step 6
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}
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var length = TypedArrayLength(taRecord); // step 7
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if (index < 0 || index >= length) { return false; } // step 8
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return true; // step 9
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};
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