javascript function declaration

// variable:
var num1;
var num2;
// function:
function newFunction(num1, num2){
	return num1 * num2;
}function myFunction(var1, var2) {
  return var1 * var2;
}//Four ways to declare a function
function add(a, b) {
  return a + b;
}

var add = function(a, b) {
  return a + b;
}

var add = (a, b) => {
  return a + b;
}

var add = (a, b) => a + b;