• @[email protected]
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    82 years ago

    Most functional languages, like Haskell, ML family (SML, OCaml, F#). They’re usually not using an enum keyword though.

  • @[email protected]
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    2 years ago

    Typed functional languages usually do, as mentioned by others. This is form of Algebraic Data Type called a Sum Type (as oppose to a Product type, which is basically a normal struct).

    Here’s some examples of creating a binary tree in different languages (also Lemmy’s code formatter is terrible)

    Examples

    Haskell

    data Tree a = Empty | Leaf a | Node (Tree a) (Tree a)

    F#

    type Tree<'a> = Empty | Leaf of 'a | Node of (Tree<'a> * Tree<'a>)

    Scala

    sealed trait Tree[+A]

    case class Empty[A]() extends Tree[A]

    case class Leaf[A](a: A) extends Tree[A]

    case class Node[A](left: Tree[A], right: Tree[A]) extends Tree[A]

    Rust

    enum Tree<T> {

    Empty,

    Leaf(T),

    Node(Box<Tree<T>>, Box<Tree<T>>),

    }

  • @[email protected]
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    12 years ago

    Can you give examples? From the description, it seems like most languages (like Java) can store data in enums?

    • @[email protected]
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      42 years ago

      I think they mean that enum variants can contain fields, i.e. individual variants are themselves structs or tuple structs. AFAIK the closest thing to this in a C-like lang would be a tagged union type.

      • @[email protected]OP
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        32 years ago

        oh yes thats what i mean. Coded in rust, loved this feature, went back to python a bit and became sad that I couldnt do the same. Feels stupid that a variable can be different types depending on the situation, and having a dataclass where just one field is relevant seems too dumb