nixir

let

  # Recursive factorial

  factorial = n:

    if n <= 1

    then 1

    else n * factorial (n - 1);

  # Fibonacci sequence generator

  fib = n:

    if n <= 1

    then n

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

  # List concatenation test

  range = start: end:

    if start >= end

    then []

    else [start] ++ range (start + 1) end;

  # Curried function application

  add = x: y: x + y;

  add5 = add 5;

  # Complex computation

  compute = x: y: let

    a = x * 2;

    b = y + 10;

    c = a * b;

  in

    c / 2;

  # Data structures

  numbers = range 1 11;

  # Nested attribute operations

  base = {

    config = {

      enable = true;

      value = 42;

    };

    data = {

      items = [1 2 3];

    };

  };

  extended =

    base

    // {

      config =

        base.config

        // {

          extra = "test";

          multiplied = base.config.value * 2;

        };

      computed = base.config.value + 100;

    };

  # Recursive attrset with selections

  recursive = rec {

    x = 10;

    y = x * 2;

    z = y + x;

    result = z * 3;

    final = result + x;

  };

in {

  fact5 = factorial 5;

  fib7 = fib 7;

  sum15 = add5 10;

  computed = compute 10 20;

  inherit numbers extended;

  deepValue = extended.config.multiplied;

  recursiveResult = recursive.result;

  recursiveFinal = recursive.final;

}