nixir

let

  # Recursive fibonacci (not memoized)

  fib = n:

    if n <= 1

    then n

    else fib (n - 1) + fib (n - 2);

  # List operations

  numbers = [1 2 3 4 5 6 7 8 9 10];

  doubled = builtins.map (x: x * 2) numbers;

  # Attrset operations

  base = {

    a = 1;

    b = 2;

    c = 3;

  };

  extended =

    base

    // {

      d = 4;

      e = 5;

    };

  # String operations

  greeting = "Hello";

  message = "${greeting}, World!";

in {

  fibonacci_10 = fib 10;

  inherit doubled extended message;

}