Frust

Functional programming in Rust. Still largely a WIP.

General idea

Hopefully, make things easier by allowing stuff like this:

use frust::monoid::*;

let v = vec![Some(1), Some(3)];
assert_eq!(combine_all(&v), Some(4));

// Slightly more magical
let t1 = (1, 2.5f32, String::from("hi"), Some(3));
let t2 = (1, 2.5f32, String::from(" world"), None);
let t3 = (1, 2.5f32, String::from(", goodbye"), Some(10));
let tuples = vec![t1, t2, t3];

let expected = (3, 7.5f32, String::from("hi world, goodbye"), Some(133));
assert_eq!(combine_all(&tuples), expected);

Todo

Lots, but for starters, these are not implemented at all, nor do I know for sure if they are possible given that Rust has no support for Higher Kinded Types.

0. Functor
1. Monad
2. Apply
3. Applicative

Show, Monoid, and Semigroup are at least partially (mostly?) implemented.

Benchmarks would be nice but they're an unstable feature, so perhaps in a different branch.

Inspirations

Scalaz, Cats, Haskell, the usual suspects ;)

Contributing

Yes please !

The following are considered important, in keeping with the spirit of Rust and functional programming:

• Safety (type and memory)
• Efficiency
• Correctness