recursive fibonacci ruby example

gistfile1.rb

def fib(number)
  return 0 if number < 1
  return 1 if number == 1
  fib = fib(number-1) + fib(number-2)
end


puts fib(0) == 0
puts fib(1) == 1
puts fib(2) == 1
puts fib(3) == 2
puts fib(4) == 3
puts fib(5) == 5
puts fib(6) == 8
puts fib(7) == 13