You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
30 lines
884 B
30 lines
884 B
'use strict'; |
|
|
|
var $TypeError = require('es-errors/type'); |
|
var isNegativeZero = require('math-intrinsics/isNegativeZero'); |
|
|
|
var IsDetachedBuffer = require('./IsDetachedBuffer'); |
|
|
|
var isInteger = require('math-intrinsics/isInteger'); |
|
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 (!isInteger(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 |
|
};
|
|
|