A friendly programming language from the future.

  • @Solumbran
    665 months ago
    helloWorld : '{IO, Exception} () 
    helloWorld _ = printLine "Hello World"

    I wouldn’t call it friendly.

      • @dneaves
        5 months ago

        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
          5 months ago

          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)
          • @dneaves
            25 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 ((&))
            processNumbers numbers =
                    isEven n = mod n 2 == 0
                    & List.filter isEven
                    & List.map (^2)
            main =
                processNumbers [1, 2, 3, 4, 5, 6]
                    & print
      • @hansl
        15 months ago

        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.

          • @hansl
            15 months ago

            I’m not sure what you’re asking. Plenty of modern languages use the unit type; typescript, Rust, not sure you consider Haskell a modern language.

            From the look of it, this language seems to use it in a function signature declaration, which would make sense.