function each(f, arr) {
  for(var i=0; i < arr.length; i++) {
    f.apply(null, [arr[i]])
  }
}

function map(f, arr) {
  var result = []
  each(function(e) {
    result.push(f.apply(null, [e]))
  }, arr)
  return result
}

function fib(n) {
  if(n <= 1) {
    return n
  } else {
    return fib(n-1) + fib(n-2)
  }
}

print("Double")
each(print, map(function(e){
  return e * e
}, [1,2,3,4,5]))

print("\n")

print("Fib")
each(print, map(fib, [1,2,3,4,5,6,7,8,9,10]))