code: func fibonacciNumber(n uint) uint {
  	if 0 == n {
  		return 0
  	} else if 1 == n {
  		return 1
  	} else {
  		return fibonacciNumber(n-1) + fibonacciNumber(n-2)
  	}
  }
docs: // fibonacciNumber calculates the Fibonacci sequence number for the given
  // sequence position.