NymphProgramming Language

A simple language that gets out of your way.

Expression-oriented

Immutable values, matches, folds, and state loops make data flow explicit.

Structs, enums, and matching

Model your domain with product and sum types, then take them apart with exhaustive pattern matching.

No null, no exceptions

Absence is Option, failure is Result — both ambient, both checked, so callers can't forget the edge cases.

Core APIs such as Option, Result, operators, and iteration are ambient. Other standard-library modules are opt-in through std/...; project modules use source-rooted @/... or relative ./... and ../... imports.

hello_world.nymfunctions.nymtypes.nymlists.nym

nym

import std/io

func main() = {
  io.println("Hello world!")
}

nym

func factorial(n: int): int = match (n) {
  ..=1 -> 1,
  _ -> n * factorial(n - 1),
}

nym

enum BinaryTree<T> {
  Leaf(value: T),
  Node(left: BinaryTree<T>, right: BinaryTree<T>),
}

nym

func odd_squares(nums: #[int]): #[int] = nums
  .iter()
  .filter((value: int) -> value % 2 == 1)
  .map((value: int) -> value ** 2u)
  .to_list()