31 lines
797 B
JavaScript
31 lines
797 B
JavaScript
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $TypeError = GetIntrinsic('%TypeError%');
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var IsInteger = require('./IsInteger');
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var isNegativeZero = require('../helpers/isNegativeZero');
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var typedArrayBuffer = require('typed-array-buffer');
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// https://262.ecma-international.org/11.0/#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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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'); // step 2
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}
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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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