function foo() {

    var a = arguments.length;
    console.log("number of parameters passed = " + a);
    console.log(arguments[0]); // print first element
    for (var i = 0; i < arguments.length; i++) {
        console.log("value of " + (i + 1) + " parameters = " + arguments[i]);
    }
}

foo(7, 8, 89, 78);