how many parameter set in javascript code example

Example 1: javascript function variable arguments

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

foo(1,2,3);
//1
//2
//3

Example 2: js array as parameter

function myFunction(a, b, c) {//number of parameters should match number of items in your array
  	//simple use example
  	console.log("a: " + a);
  	console.log("b: " + b);
  	console.log("c: " + c);
}

var myArray = [1, -3, "Hello"];//define your array
myFunction.apply(this, myArray);//call function