Playground ​

cell fibonacci(n: Int) -> Int
  if n <= 1
    return n
  end
  return fibonacci(n - 1) + fibonacci(n - 2)
end

cell main() -> Int
  return fibonacci(10)
end

cell classify(n: Int) -> String
  match n
    0 -> return "zero"
    1 -> return "one"
    _ -> return "many"
  end
end

cell main() -> String
  return classify(5)
end

record Product
  name: String where length(name) > 0
  price: Float where price >= 0.0
end

cell total(products: list[Product]) -> Float
  let sum = 0.0
  for p in products
    sum += p.price
  end
  return sum
end

cell main() -> Float
  let items = [
    Product(name: "Apple", price: 1.50),
    Product(name: "Banana", price: 0.75)
  ]
  return total(items)
end

cell divide(a: Int, b: Int) -> result[Int, String]
  if b == 0
    return err("Division by zero")
  end
  return ok(a / b)
end

cell main() -> String
  match divide(10, 2)
    ok(value) -> return "Result: {value}"
    err(msg) -> return "Error: {msg}"
  end
end