Return the n numbers in the Fibonacci sequence

fibonacci.rb

def fib(n, sequence = [1, 1])
  return [n] if n == 0
  return [n] if n == 1
  sequence << sequence[-1] + sequence[-2] while sequence.length < n
  sequence
end

# fib(0) => [0]
# fib(1) => [1]
# fib(10) => [1, 1, 2, 3, 5, 8, 13, 21, 34, 55]