1

I've already read similar questions/answer, but none of it resolve my problem.

I've an object like this

class Chat {
    unreadMessages: Int = 0
    messages: Int = 0
}

Then I have an array of Chat objects, and I need to order it by multiple criteria, first by chat with grater unread messages and then chat with grater total messages.

Es. 

  Obj  TotMes Unread  
  Chat A 10 3   
  Chat B  1 0     
  Chat C  4 0   
  Chat D  9 9

Desidered output: 

Chat D  9 9   
Chat A 10 3   
Chat C  4 0  
Chat B  1 0

I try with this sort alhoritm, but don't seems work:

let sorted = chats.sort({ (c1, c2) -> Bool in   
   if c1.unreadMessages > c2.unreadMessages {
      return true
   }
   if c1.messages > c2.messages {
      return true
   }        
   return false
})

Can someone explain me what is wrong with this?

Improve this question
2
  • You could sort array by using predicate rules Commented Nov 24, 2015 at 8:58
  • Think about it: What should happen if c1.unreadMessages < c2.unreadMessages ? Commented Nov 24, 2015 at 9:01

1 Answer 1

Reset to default
5

You haven't got condition for c1.unreadMessages < c2.unreadMessages that should cover all requirements:

let sorted = chats.sort({ (c1, c2) -> Bool in   
   if c1.unreadMessages > c2.unreadMessages {
      return true
   } else if c1.unreadMessages < c2.unreadMessages {
      return false
   } else if c1.messages > c2.messages {
      return true
   }        
   return false
})
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1 Comment

Damn! Sure I forget one condition.. my fault! Thanks man!

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