what is a parameter 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: parameters in javascript

function myFunction(x, y) {
  if (y === undefined) {
    y = 2;
  }
}