MLscript - Programming language

terminal edit

MLscript is a programming language created in 2020 by Luyu Cheng and Lionel Parreaux.

#1039on PLDB

4Years Old

Download source code:

git clone https://github.com/hkust-taco/mlscript/

REPL · Source Code

A step towards rethinking pattern matching to make it more powerful and natural to use.

Tags: programming language
MLscript is developed on GitHub and has 170 stars
Early development of MLscript happened in HKUST
ML and OCaml and Haskell and Standard ML and Scala and Rust influenced the design of MLscript
MLscript is written in Scala, Standard ML, TypeScript, Markdown, JSON, HTML, JavaScript, CSS, Nix, YAML, Make
First announcement of MLscript

Example from the web:

type List[A] = Cons[A] | Nil

class Cons[out A](head: A, tail: List[A]) {
  fun map: (A -> 'B) -> List['B]
  map(f) = Cons of f(head), tail.map(f)
}
module Nil {
  fun map(f) = Nil
}

fun (::) cons(x, xs) = Cons(x, xs)

fun show(xs) =
  let rec go(xs) = if xs is
    Cons(h, Nil) then String(h)
    Cons(h, t)   then join(String(h), ", ", go(t))
    Nil          then ""
  join("[", go(xs), "]")

let xs = 1 :: 2 :: 3 :: Nil

show(xs)

show(xs.map of x => succ(x))