34 lines
935 B
JavaScript
34 lines
935 B
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var GetIntrinsic = require('get-intrinsic');
|
||
|
|
|
||
|
|
var $TypeError = GetIntrinsic('%TypeError%');
|
||
|
|
|
||
|
|
var IsDetachedBuffer = require('./IsDetachedBuffer');
|
||
|
|
var IsIntegralNumber = require('./IsIntegralNumber');
|
||
|
|
|
||
|
|
var isNegativeZero = require('../helpers/isNegativeZero');
|
||
|
|
|
||
|
|
var typedArrayBuffer = require('typed-array-buffer');
|
||
|
|
|
||
|
|
// https://262.ecma-international.org/12.0/#sec-isvalidintegerindex
|
||
|
|
|
||
|
|
module.exports = function IsValidIntegerIndex(O, index) {
|
||
|
|
// Assert: O is an Integer-Indexed exotic object.
|
||
|
|
var buffer = typedArrayBuffer(O); // step 1
|
||
|
|
|
||
|
|
if (typeof index !== 'number') {
|
||
|
|
throw new $TypeError('Assertion failed: Type(index) is not Number');
|
||
|
|
}
|
||
|
|
|
||
|
|
if (IsDetachedBuffer(buffer)) { return false; } // step 2
|
||
|
|
|
||
|
|
if (!IsIntegralNumber(index)) { return false; } // step 3
|
||
|
|
|
||
|
|
if (isNegativeZero(index)) { return false; } // step 4
|
||
|
|
|
||
|
|
if (index < 0 || index >= O.length) { return false; } // step 5
|
||
|
|
|
||
|
|
return true; // step 6
|
||
|
|
};
|