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

submitted 10 months ago by [email protected] to c/[email protected]

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A friendly programming language from the future.

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[–] Solumbran 66 points 10 months ago (1 children)

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

I wouldn't call it friendly.

[+] [email protected] 4 points 10 months ago (3 children)

[deleted]

[–] dneaves 7 points 10 months ago* (last edited 10 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 10 months ago* (last edited 10 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 10 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 10 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 10 months ago

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