functionFun.js

var something = function(n) {
  return doSomethingElse(n) * 2;
}

var doSomethingElse = function(m) {
  return m * 2;
}

var x = something(5);
var y = something(100);
var whatIsThis = something();

console.log('x is :', x);
console.log('y is: ', y);
console.log('this?: ', whatIsThis)