source: imaps-frontend/node_modules/es-abstract/2021/IsValidIntegerIndex.js@ 79a0317

'use strict';

var $TypeError = require('es-errors/type');
var isNegativeZero = require('math-intrinsics/isNegativeZero');

var IsDetachedBuffer = require('./IsDetachedBuffer');
var IsIntegralNumber = require('./IsIntegralNumber');

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
};