// We have this enum.
enum Formula {
  case proposition(String)
  indirect case negation(Formula)
  indirect case operation(op: String, lhs: Formula, rhs: Formula)

  var nnf: Formula { /* ... */  }
}

// And now ...

switch formula.nnf {
 case .proposition(_):
   return formula.nnf
 case .negation(_):
   return formula.nnf
 case .operation(_, _, _):
   return formula.nnf
}
By Anonymous, 2018-01-08 11:04:54

if let _ = detailInformation {
     loadDetailInformation()
}

when optionals are killing yourself

By gc, 2017-12-13 00:19:02
guard let reachability = Reachability(), reachability.isReachable == true else {
    // No network connection available. Do stuff.
    ...
}

While this works, it's not immediately readable and creates confusion. Mis-using Swift's control flow. Did not pass code review.

By Anonymous, 2017-12-22 10:04:01
        var validAccountData = account.email != nil
        validAccountData = account.firstName != nil
        validAccountData = account.lastName != nil
        
        if validAccountData {
            return account
        }
        
        return nil

Proper validation

By Anonymous, 2017-12-12 15:17:35