How to create a loop in js for counting

[dragon slayer]

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    //count how many ids.
    var myArray = [0x13bb, 0x13be]
    for (var i = 0; i < myArray.length; i++)
    {
        pUser.SysMessage( '%d:', myArray[i] ); //says both of my ids
    }

    var index = i % 10;
    pUser.SysMessage( '%d:', index ); // number of ids = 2

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This will count how many items are in my loop