function fac(n){
  if (n==1) return 1;
  else return n*fac(n-1);
}

//pointer to a function
Func_pointer = fac; 

Test.AreEqual(fac(4), Func_pointer(4)); //Call function using pointer

//Anonimous function
aFunction = function(n){
  if (n==1) return 1;
  else return n*aFunction(n-1);
};

Test.AreEqual(fac(5), aFunction(5));