If / else expressions

[jawbroken]

I'm very interested. Here's something that I posted in the SE-0255 thread that is relevant here:

@jawbroken

Much more speculatively (and therefore not a major consideration), this proposal might also open a door for solving some other small-but-frequently-discussed annoyances in the language. e.g. there have been recent discussions in the pitch thread for if-else expressions (where if-else statements are expressions if all the clauses are single expressions) about extending that idea to switch statements as well, and implicit returns for single-expression functions would give you a nice way to write functions on enums where the body is just a switch statement. Roughly:

enum GameResult {
  case loss, draw, win
  
  func points() -> Int {
    switch self {
      case .loss: -1
      case .draw:  0
      case .win:   1
    }
  }
}