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I haven't seen it mentioned how you would do composition in Swift. I assume it has a feature like Scala's traits –– hopefully with a better syntax? Does anyone

• matthewmacleod 12y ago
  I'm not that familiar with Scala, but aren't traits basically interfaces? I imagine Swift's protocols are the same deal.
• krat0sprakhar 12y ago
  This might be helpful - https://leverich.github.io/swiftislikescala/#protocol https://leverich.github.io/swiftislikescala/#protocol
  • virtualwhys 12y ago
    Thanks for that, interesting comparison. Extensive usage of var in the examples, that's not suggested best practice in Scala, val is king, but I guess for one-to-one comparison each language does indeed express mutability similarly. `return` is implicit if expression is the last in a block, so none of the `return` statements on the Scala side are needed. Pretty interesting grab bag of functionality, I'm seeing a lot of Scala, but then bits of Python, Groovy, and Kotlin (extension methods) as well.
• gress 12y ago
  No. Swift doesn't have traits. It has protocols but these can't currently contain implementation. Implementation is currently strictly based on single inheritance with open classes (through extension).