fibonacci sequence in JavaScript

fibonacci.coffee

#without memoizing
fibonacci = ->
  if n > 2 then n else fibonacci(n - 2) + fibonacci(n - 1);

for i in [0..10]
  console.log('i = ' + fibonacci(i))

#memoize
fibonacci = do ->
  memo = [0, 1]
  
  fib = (n) ->
    if typeof memo[n] isnt 'number'
      memo[n] = fib(n - 2) + fib(n - 1)
    memo[n]
  fib
  
for i in [0..10]
  console.log('i = ' + fibonacci(i))