catch where clause

catch_where.swift

enum LavaError: Error {
  case LavaNotHotError
  case LavaTooHotError
}

struct LavaSpecialResponseCode: Error {
   enum ErrorKind: Int {
     case missingParams
     case badData
   }
  
  let message: String
  let kind: ErrorKind
}

// ... elsewhere ...

do {
  try fetchLavaResponse()
} catch LavaNotHotError {  
  // ...typical pattern
} catch where (error as? LavaSpecialResponseCode)?.kind == LavaSpecialResponseCode.ErrorKind.missingParams) {
  // this demonstrates the catch where clause. This may be useful where your errors fall just outside of the first catch pattern above
}


// ... elsewhere

func fetchLavaResponse(completion:()->()) throws {
  // request stuff 
}

Mistakenly-trailing ) near the end of line 22