send parameter in tu funktion depending on value js code example

Example 1: arguments object in javascript

var sum = 0;
function addAll(){
    for (var i = 0; i<arguments.length; i++){
        sum+=arguments[i];
    }
    console.log(sum);
}

addAll(1, 2, 3, 4, 5, 6, 7, 8, 9,10); //we can provide inifite numbers as argument

Example 2: how to check for missing parameter javascript

a = a || "AAA";