Associative Arrays (Dictionary-Style) in JavaScript with Integer Values

function TestAssociativeArray() {
    var myArray = new Array();
    //-An item can be created using either array notation ["a"] or object notation .a
    myArray.a = 0;
    //-If the item holds a number, you can easily increment it
    myArray["a"]++;
    //-To check whether an item exists in the array, compare it with undefined
    if (myArray.b == undefined) {
        //-Initialize the array item using object notation. It can be any number
        myArray.b = 0;
    }
    //-If the item is not initialized first and we try to increment it, NaN is stored as the result
    myArray["c"]++;

    alert(myArray.a);
    alert(myArray["b"]);
    alert(myArray.c);
}