Last and Unique 4 valuse in List

readme.md

Last and Unique 4 valuse in List

Created with <3 with dartpad.dev.

main.dart

class ChatsModel {
  int? id;
  String? title;
  String chatName;
  String chatType;
  String icon;
  bool isPinned;

  ChatsModel({this.id, this.title, required this.chatName, required this.chatType, required this.icon, required this.isPinned});
}

void main() {
  List<ChatsModel> chatsList = [
    ChatsModel(
    chatName: 'asds',
      chatType: 'bot',
      icon: 'dadas',
      isPinned: true,
    ),
    ChatsModel(
    chatName: 'asds',
      chatType: 'ok',
      icon: 'dadas',
      isPinned: true,
    ),
    ChatsModel(
    chatName: 'asds',
      chatType: 'bot',
      icon: 'dadas',
      isPinned: true,
    ),
    ChatsModel(
    chatName: 'asds',
      chatType: 'bot',
      icon: 'dadas',
      isPinned: true,
    ),
  ];

  Set<String> uniqueBotChatNames = {};
  List<ChatsModel> last4UniqueBotChats = [];

  for (int i = chatsList.length - 1; i >= 0; i--) {
    ChatsModel chat = chatsList[i];
    if (chat.chatType == 'bot' && uniqueBotChatNames.add(chat.chatName)) {
      last4UniqueBotChats.add(chat);
      if (last4UniqueBotChats.length == 4) {
        break;
      }
    }
  }

  // Now last4UniqueBotChats contains the last 4 unique elements where chatType is 'bot'
  for (ChatsModel chat in last4UniqueBotChats.reversed) {
    print("${chat.chatName}, ${chat.chatType}");
  }
}