qinglong_app/pub/code_field-master/example/lib/readme/fib.dart

// An expensive but pretty
// recursive implementation
int fibonacci(int n) {
  if (n <= 1) return n;
  return fibonacci(n - 1) + fibonacci(n - 2);
}

void main() {
  print("Fibonacci sequence:");
  for (var n = 0; n < 10; n++) print(fibonacci(n));
}