Fibonacci numbers in Dart

Example for versions Dart 1.1.1

This example uses recursive definition of Fibonacci numbers. Note that the language requires explicit conversion from int to String. 

int fibonacci(int n) => n <= 2 ? 1 : fibonacci(n - 2) + fibonacci (n - 1);

main() {
  String output = "";
  for (int i = 1; i <= 16; ++i) {
    output += fibonacci(i).toString() + ", ";
  }
  print(output + "...");
}