Programming

17313 readers

448 users here now

Welcome to the main community in programming.dev! Feel free to post anything relating to programming here!

Cross posting is strongly encouraged in the instance. If you feel your post or another person's post makes sense in another community cross post into it.

Hope you enjoy the instance!

Rules

Follow the programming.dev instance rules
Keep content related to programming in some way
If you're posting long videos try to add in some form of tldr for those who don't want to watch videos

Wormhole

Follow the wormhole through a path of communities [email protected]

founded 2 years ago

MODERATORS

[email protected]

Unison | A friendly, statically-typed, functional programming language from the future · Unison programming language (www.unison-lang.org)

submitted 11 months ago by [email protected] to c/[email protected]

43 comments fedilink hide all child comments

A friendly programming language from the future.

you are viewing a single comment's thread
view the rest of the comments

[–] Solumbran 66 points 11 months ago (1 children)

helloWorld : '{IO, Exception} () 
helloWorld _ = printLine "Hello World"

I wouldn't call it friendly.

[+] [email protected] 4 points 11 months ago (3 children)

[deleted]

[–] dneaves 7 points 11 months ago* (last edited 11 months ago) (1 children)

Although, i would agree with it not necessarily being "friendly", since its a drastically different syntax than many beginners would be used to, the brackets and parenthesis here are not what you think they are.

Unison is a language in the style of Haskell, F#, Purescript, Elm, etc. So that first line is actually type annotations.

In Haskell, this would just be helloWorld :: IO () , meaning a function named "helloWorld" with no arguments and produces what is essentally a potentially-unsafe IO action with a Void return (the empty parenthesis () ).

Here in Unison they call the bracket part "abilities" or something. Its saying the same thing as Haskell, but being more explicit in saying it can raise an exception.

[–] abhibeckert -4 points 11 months ago* (last edited 11 months ago) (1 children)

Yeah sorry - that's just unnecessarily obtuse. Programming languages just don't need to be that convoluted. Hello world should look something like this:

print("Hello, World!")

And when you need more complexity, it can still be far simpler than Unison (or Haskel). For example this (in Swift):

func processNumbers(_ numbers: [Int]) -> [Int] {
    return numbers.filter { $0 % 2 == 0 }.map { $0 * $0 }
}

let numbers = [1, 2, 3, 4, 5, 6]
let processedNumbers = processNumbers(numbers)
print(processedNumbers)

[–] dneaves 2 points 11 months ago

Hello world should look something like this: print("Hello, World"!)

You don't need the annotation line in Haskell-esque languages, most of the time. Without the annotation, this is Hello World in Haskell:

main = print "Hello, World!"

And when you need more complexity, it can still be far simpler than Unison (or Haskell)

import qualified Data.List as List
import Data.Function ((&amp;))

processNumbers numbers =
    let
        isEven n = mod n 2 == 0
    in
    numbers
        &amp; List.filter isEven
        &amp; List.map (^2)

main =
    processNumbers [1, 2, 3, 4, 5, 6]
        &amp; print

[–] hansl 1 points 11 months ago (1 children)

It’s not parenthesis (in the PEMDAS sense), it’s the unit type and it’s normally expressed like that. If you’re not familiar with type systems, it’s the typing equivalent of void.

[–] [email protected] 1 points 11 months ago

What do you mean by flipped? Parentheses seem to group expressions like in most languages.