Crates.io | kind2 |
lib.rs | kind2 |
version | 0.3.10 |
source | src |
created_at | 2022-03-17 17:52:14.417667 |
updated_at | 2023-05-11 11:58:57.560218 |
description | A pure functional functional language that uses the HVM. |
homepage | |
repository | https://github.com/Kindelia/Kind2 |
max_upload_size | |
id | 551934 |
size | 58,900 |
Kind2 is a functional programming language and proof assistant.
It is a complete rewrite of Kind1, based on HVM, a lazy, non-garbage-collected and massively parallel virtual machine. In our benchmarks, its type-checker outperforms every alternative proof assistant by a far margin, and its programs can offer exponential speedups over Haskell's GHC. Kind2 unleashes the inherent parallelism of the Lambda Calculus to become the ultimate programming language of the next century.
Welcome to the inevitable parallel, functional future of computers!
Pure functions are defined via equations, as in Haskell:
// Applies a function to every element of a list
map <a> <b> (list: List a) (f: a -> b) : List b
map a b Nil f = Nil
map a b (Cons head tail) f = Cons (f head) (map tail f)
Side-effective programs are written via monads, resembling Rust and TypeScript:
// Prints the double of every number up to a limit
Main : IO (Result () String) {
ask limit = IO.prompt "Enter limit:"
for x in (List.range limit) {
IO.print "{} * 2 = {}" x (Nat.double x)
}
return Ok ()
}
Theorems can be proved inductively, as in Agda and Idris:
// Black Friday Theorem. Proof that, for every Nat n: n * 2 / 2 == n.
black_friday_theorem (n: Nat) : Equal Nat (Nat.half (Nat.double n)) n
black_friday_theorem Nat.zero = Equal.refl
black_friday_theorem (Nat.succ n) = Equal.apply (x => Nat.succ x) (black_friday_theorem n)
For more examples, check the Kindex.
First, install Rust first, then enter:
cargo +nightly install kind2
New versions probably are not in cargo
, so you can install the current version of kind2 by following these instructions:
cargo install --path crates/kind-cli --force
Then, use any of the commands below:
Command | Usage | Note |
---|---|---|
Check | kind2 check file.kind2 |
Checks all definitions. |
Eval | kind2 eval file.kind2 |
Runs using the type-checker's evaluator. |
Run | kind2 run file.kind2 |
Runs using HVM's evaluator, on Rust-mode. |
To-HVM | kind2 to-hvm file.kind2 |
Generates a .hvm file. Can then be compiled to C. |
To-KDL | kind2 to-kdl file.kind2 |
Generates a .kdl file. Can then be deployed to Kindelia. |
Executables can be generated via HVM:
kind2 to-hvm file.kind2
hvm compile file.hvm
clang -O2 file.c -o file
./file
If you need support related to Kind, email support.kind@kindelia.org
For Feedbacks, email kind@kindelia.org
To ask questions and join our community, check our Discord Server.