fibonacci

fib.scala

def fibonacci(number: Int): Int = {
  assert(number >= 0)

  @annotation.tailrec def inner(prev: Int, curr: Int, n: Int): Int =
    if (n < number) inner(curr, prev + curr, n + 1)
    else curr

  if (number == 0) 0
  else if (number == 1) 1
  else inner(0, 1, 1)
}

println((0 to 10).map(fibonacci))