source: imaps-frontend/node_modules/es-abstract/2023/IsValidIntegerIndex.js

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Last change on this file was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago

Update repo after prototype presentation

  • Property mode set to 100644
File size: 887 bytes
Line 
1'use strict';
2
3var $TypeError = require('es-errors/type');
4
5var IsDetachedBuffer = require('./IsDetachedBuffer');
6var IsIntegralNumber = require('./IsIntegralNumber');
7
8var isNegativeZero = require('../helpers/isNegativeZero');
9
10var typedArrayBuffer = require('typed-array-buffer');
11
12// https://262.ecma-international.org/12.0/#sec-isvalidintegerindex
13
14module.exports = function IsValidIntegerIndex(O, index) {
15 // Assert: O is an Integer-Indexed exotic object.
16 var buffer = typedArrayBuffer(O); // step 1
17
18 if (typeof index !== 'number') {
19 throw new $TypeError('Assertion failed: Type(index) is not Number');
20 }
21
22 if (IsDetachedBuffer(buffer)) { return false; } // step 2
23
24 if (!IsIntegralNumber(index)) { return false; } // step 3
25
26 if (isNegativeZero(index)) { return false; } // step 4
27
28 if (index < 0 || index >= O.length) { return false; } // step 5
29
30 return true; // step 6
31};
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