forinenumcache.js

//-------------------------------------------------------------------------------------------------------
// Copyright (C) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
//-------------------------------------------------------------------------------------------------------


function createObject()
{
    var obj = new Object();
    obj.a = 1;
    obj.b = 2;
    obj.c = 3;
    obj.d = 4;
    return obj;
}

function createObject2()
{
    var obj = new Object();
    obj.e = 1;
    obj.b = 2;
    obj.c = 3;
    obj.d = 4;
    return obj;
}

var testnumber = 1;
// Test initial cache data population
WScript.Echo("test " + testnumber++);
var obj = createObject();
for (var i in obj)
{
    WScript.Echo(i + " = " + obj[i]);
}

// Test using cached data
WScript.Echo("test " + testnumber++);
var obj = createObject();
for (var i in obj)
{
    WScript.Echo(i + " = " + obj[i]);
}

// Test property delete 
WScript.Echo("test " + testnumber++);
var c = 0;
var obj = createObject();
for (var i in obj)
{
    c++;
    WScript.Echo(i + " = " + obj[i]);
    if (c == 2)
    {
        delete obj.d;
    }
}

// Test property delete and add back
WScript.Echo("test " + testnumber++);
var c = 0;
var obj = createObject();
for (var i in obj)
{
    c++;
    WScript.Echo(i + " = " + obj[i]);
    if (c == 2)
    {
        delete obj.d;
    }
    else if (c == 3)
    {
        obj.d = 5;
    }
}

// Test two for in enumerator simultaneously updating the enumerator data cache
WScript.Echo("test " + testnumber++);
var obj = createObject2();

for (var i in obj)
{
    var c = 0;
    for (var j in obj)
    {
        WScript.Echo(i + "," + j);
        if (c == 1)
        {   
            break;
        }
        if (i == j)
        {
            c = 1;
        }
        
    }
}