TanTan
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31 lines
884 B
Plaintext
31 lines
884 B
Plaintext
'use strict';
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var $TypeError = require('es-errors/type');
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var isNegativeZero = require('math-intrinsics/isNegativeZero');
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var IsDetachedBuffer = require('./IsDetachedBuffer');
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var isInteger = require('math-intrinsics/isInteger');
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var typedArrayBuffer = require('typed-array-buffer');
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// https://262.ecma-international.org/12.0/#sec-isvalidintegerindex
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module.exports = function IsValidIntegerIndex(O, index) {
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// Assert: O is an Integer-Indexed exotic object.
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var buffer = typedArrayBuffer(O); // step 1
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if (typeof index !== 'number') {
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throw new $TypeError('Assertion failed: Type(index) is not Number');
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}
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if (IsDetachedBuffer(buffer)) { return false; } // step 2
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if (!isInteger(index)) { return false; } // step 3
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if (isNegativeZero(index)) { return false; } // step 4
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if (index < 0 || index >= O.length) { return false; } // step 5
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return true; // step 6
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};
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