Roy 
Roy is a small functional language that compiles to JavaScript. It has a few main features:
- Damas-Hindley-Milner type inference
- Whitespace significant syntax
- Simple tagged unions
- Pattern matching
- Structural typing
- Monad syntax
- Not-horrible JS output
Usage
To compile:
make deps
make
To enter a REPL:
./roy
To compile and run a .roy file:
./roy -r examples/helloworld.roy
To compile a .roy file to .js:
./roy examples/helloworld.roy
cat examples/helloworld.js
Example
Input (test.roy):
let addTwo n =
n + 2
console.log (addTwo 40)
Output (test.js):
var addTwo = function(n) {
return n + 2;
}
console.log(addTwo(40))
Calling addTwo "test" will result in a compile-time error (addTwo can only take a Number).
See the examples directory for more.
License
MIT
Editor Support
Resources
- Roy website: http://roy.brianmckenna.org/
- Roy Google Group: http://groups.google.com/group/roylang
- Roy docs: http://guide.roylang.org/
- Roy Twitter: http://twitter.com/roylangjs
- Bitbucket repo: https://bitbucket.org/puffnfresh/roy
- GitHub repo: https://github.com/puffnfresh/roy
- Brian's blog: http://brianmckenna.org/
- altJS channel: irc://irc.freenode.net/altJS
- roy channel: irc://irc.freenode.net/roy