diff --git a/src/app/app.component.ts b/src/app/app.component.ts
index 8e31a5b..573d806 100644
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@@ -12,29 +12,29 @@ export class AppComponent implements OnInit {
 
   constructor(private data: DatasharingService, private selfservice: SelfService) { }
 
-  userInfo: User
+  userInfo: User;
 
-  loggedIn : boolean = false;
-  userID : number;
-  username : string;
-  handle : string;
-  email : string;
-  points : number;
-  level : number;
+  loggedIn = false;
+  userID: number;
+  username: string;
+  handle: string;
+  email: string;
+  points: number;
+  level: number;
 
-  friendIDs : number[];
-  groupIDs : number[];
-  chatIDs : number[];
+  friendIDs: number[];
+  groupIDs: number[];
+  chatIDs: number[];
 
-  requestIDs : number[];
+  requestIDs: number[];
 
   ngOnInit() {
     this.data.currentUserInfo.subscribe(user => {
       this.userInfo = user;
       console.log(this.userInfo);
-      this.data.changeChatIDs(user.chatIDs)
-    })
-    if(this.loggedIn != true){
+      this.data.changeChatIDs(user.chatIDs);
+    });
+    if (this.loggedIn != true) {
       this.selfservice.checkIfLoggedIn();
     }
   }
diff --git a/src/app/app.module.ts b/src/app/app.module.ts
index 257c412..16e0e13 100644
--- a/src/app/app.module.ts
+++ b/src/app/app.module.ts
@@ -63,7 +63,7 @@ const appRoutes: Routes = [
   { path: 'register', component: RegisterComponent },
   { path: 'about', component: AboutComponent },
   { path: 'imprint', component: ImprintComponent },
-]
+];
 
 @NgModule({
   declarations: [
diff --git a/src/app/components/app-scaffold/app-scaffold.component.ts b/src/app/components/app-scaffold/app-scaffold.component.ts
index e16399e..2ad77f7 100644
--- a/src/app/components/app-scaffold/app-scaffold.component.ts
+++ b/src/app/components/app-scaffold/app-scaffold.component.ts
@@ -15,57 +15,56 @@ import { environment } from 'src/environments/environment';
 })
 
 export class AppScaffoldComponent implements OnInit {
-  loggedIn: boolean = false;
+  loggedIn = false;
   userId: number;
-  username: string
-  user: User
-  levellist: Levellist = new Levellist()
-  level: string
-  points: number
+  username: string;
+  user: User;
+  levellist: Levellist = new Levellist();
+  level: string;
+  points: number;
   profileUrl: string;
 
-  dropdownShown: boolean = false
+  dropdownShown = false;
 
-  constructor(private data: DatasharingService,private selfservice: SelfService, private http: Http, private router: Router) { }
+  constructor(private data: DatasharingService, private selfservice: SelfService, private http: Http, private router: Router) { }
 
   ngOnInit() {
     this.data.currentUserInfo.subscribe(user => {
-      this.user = user
+      this.user = user;
       this.loggedIn = user.loggedIn;
       this.userId = user.userID;
-      this.username = user.username
-      this.level = this.levellist.getLevelName(user.level)
-      this.points = user.points
+      this.username = user.username;
+      this.level = this.levellist.getLevelName(user.level);
+      this.points = user.points;
       this.profileUrl = '/profile/' + this.userId;
-    })    
+    });
   }
 
   showDropdown() {
-    if(!this.dropdownShown) {
-      this.dropdownShown = true
-    }
-    else {
-      this.dropdownShown = false
+    if (!this.dropdownShown) {
+      this.dropdownShown = true;
+    } else {
+      this.dropdownShown = false;
     }
   }
 
   logout() {
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
 
     const body = {query: `mutation {
         logout
-      }`}
- 
+      }`};
+
     this.http.post(url, body).subscribe(response => {
-        console.log(response.text())})
-    this.loggedIn = false
-    let user = new User()
-    user.loggedIn = false
-    this.data.changeUserInfo(user)
-    this.router.navigate(['login'])
+        console.log(response.text()); });
+    this.loggedIn = false;
+    const user = new User();
+    user.loggedIn = false;
+    this.data.changeUserInfo(user);
+    this.router.navigate(['login']);
   }
 
 }
diff --git a/src/app/components/chat/chat.component.ts b/src/app/components/chat/chat.component.ts
index 2cc80d4..7727629 100644
--- a/src/app/components/chat/chat.component.ts
+++ b/src/app/components/chat/chat.component.ts
@@ -11,7 +11,7 @@ import { Chat } from 'src/app/models/chat';
 })
 export class ChatComponent implements OnInit {
 
-  messages:Array<Chatmessage>
+  messages: Array<Chatmessage>;
 
   @Output() goBackEvent = new EventEmitter<boolean>();
   @Input() childChat: Chat;
@@ -19,29 +19,28 @@ export class ChatComponent implements OnInit {
   constructor(private chatService: ChatService) { }
 
   ngOnInit() {
-    this.refresh()
+    this.refresh();
   }
 
   goBack() {
-    this.goBackEvent.emit(true)
+    this.goBackEvent.emit(true);
   }
 
   sendMessage(pElement) {
     this.chatService.sendMessage(this.childChat.id, pElement.value)
     .subscribe(response => {
-      console.log("Message sent")
-      pElement.value = ""
-      this.refresh()
-    })
+      console.log('Message sent');
+      pElement.value = '';
+      this.refresh();
+    });
   }
 
   refresh() {
     this.chatService.getMessagesRaw(this.childChat.id)
-    .subscribe(response => 
-      {
-        console.log("Downloading messages ...")
-        this.messages = this.chatService.renderMessages(response.json())
-      })
+    .subscribe(response => {
+        console.log('Downloading messages ...');
+        this.messages = this.chatService.renderMessages(response.json());
+      });
   }
 
 }
diff --git a/src/app/components/chatlist/chatlist.component.ts b/src/app/components/chatlist/chatlist.component.ts
index 341c809..f648e12 100644
--- a/src/app/components/chatlist/chatlist.component.ts
+++ b/src/app/components/chatlist/chatlist.component.ts
@@ -10,7 +10,7 @@ import { ChatService } from 'src/app/services/chat/chat.service';
 })
 export class ChatlistComponent implements OnInit {
 
-  @Input() childChats: Array<Chat>
+  @Input() childChats: Array<Chat>;
   @Output() showChatEvent = new EventEmitter<Chat>();
   @Output() showCreateChatEvent = new EventEmitter<boolean>();
   selectedChat: Chat;
@@ -18,20 +18,20 @@ export class ChatlistComponent implements OnInit {
   constructor(private chatService: ChatService) { }
 
   ngOnInit() {
-    
+
   }
 
   showNewChat() {
-    this.showCreateChatEvent.emit(true)
+    this.showCreateChatEvent.emit(true);
   }
 
   showChat(pChat: Chat) {
-    this.selectedChat = pChat
-    this.showChatEvent.emit(this.selectedChat)
+    this.selectedChat = pChat;
+    this.showChatEvent.emit(this.selectedChat);
   }
 
 
   newChat() {
-    console.error("not implemented")
+    console.error('not implemented');
   }
 }
diff --git a/src/app/components/chatmanager/chatcontacts/chatcontacts.component.ts b/src/app/components/chatmanager/chatcontacts/chatcontacts.component.ts
index 481f7b1..2ccfa3b 100644
--- a/src/app/components/chatmanager/chatcontacts/chatcontacts.component.ts
+++ b/src/app/components/chatmanager/chatcontacts/chatcontacts.component.ts
@@ -10,7 +10,7 @@ import { ChatService } from 'src/app/services/chat/chat.service';
 export class ChatcontactsComponent implements OnInit {
 
   @Output() goBackEvent = new EventEmitter<boolean>();
-  selectedContact: FriendInfo
+  selectedContact: FriendInfo;
 
   constructor(private chatService: ChatService) { }
 
@@ -18,17 +18,17 @@ export class ChatcontactsComponent implements OnInit {
   }
 
   goBack() {
-    this.goBackEvent.emit(true)
+    this.goBackEvent.emit(true);
   }
 
   createChat(pFriendInfo: FriendInfo) {
-    this.selectedContact = pFriendInfo
-    this.chatService.createNewChat(pFriendInfo.id)
-    this.goBack()
+    this.selectedContact = pFriendInfo;
+    this.chatService.createNewChat(pFriendInfo.id);
+    this.goBack();
   }
 
   contactList() {
-    console.error("Not Imlemented!")
+    console.error('Not Imlemented!');
   }
 
 }
diff --git a/src/app/components/chatmanager/chatmanager.component.ts b/src/app/components/chatmanager/chatmanager.component.ts
index 74a1fc8..db1550a 100644
--- a/src/app/components/chatmanager/chatmanager.component.ts
+++ b/src/app/components/chatmanager/chatmanager.component.ts
@@ -1,5 +1,5 @@
 import { Component, OnInit, ViewChild } from '@angular/core';
-import { ChatService } from '../../services/chat/chat.service'
+import { ChatService } from '../../services/chat/chat.service';
 import { ChatComponent } from '../chat/chat.component';
 import { Chatinfo } from 'src/app/models/chatinfo';
 import { DatasharingService } from 'src/app/services/datasharing.service';
@@ -12,12 +12,12 @@ import { Chat } from 'src/app/models/chat';
 })
 export class ChatmanagerComponent implements OnInit {
 
-  showChatlist: boolean = true
-  showChat: boolean = false
-  showCreateNewChat: boolean = false
+  showChatlist = true;
+  showChat = false;
+  showCreateNewChat = false;
 
-  parentSelectedChat: Chat
-  parentChats: Array<Chat>
+  parentSelectedChat: Chat;
+  parentChats: Array<Chat>;
 
   constructor(private data: DatasharingService, private chatService: ChatService) { }
 
@@ -25,36 +25,36 @@ export class ChatmanagerComponent implements OnInit {
     /*this.data.currentChatIDs.subscribe(chatIDs => {
       this.parentChatIds = chatIDs
     })*/
-    this.refresh()
+    this.refresh();
   }
 
   goBackToChatlist($event) {
-    this.showChatlist = $event
-    this.showChat = false
-    this.showCreateNewChat = false
+    this.showChatlist = $event;
+    this.showChat = false;
+    this.showCreateNewChat = false;
 
-    this.refresh()
+    this.refresh();
   }
 
   showSpecialChat($event) {
-    this.parentSelectedChat = $event
-    this.showChatlist = false
-    this.showChat = true
-    this.showCreateNewChat = false
+    this.parentSelectedChat = $event;
+    this.showChatlist = false;
+    this.showChat = true;
+    this.showCreateNewChat = false;
   }
 
   showNewChat($event) {
-    this.showChatlist = false
-    this.showChat = false
-    this.showCreateNewChat = $event
+    this.showChatlist = false;
+    this.showChat = false;
+    this.showCreateNewChat = $event;
   }
 
   refresh() {
     this.chatService.getAllChatsRaw()
     .subscribe(response => {
-        console.log(response)
-        this.parentChats = this.chatService.renderAllChats(response.json())
-      })
+        console.log(response);
+        this.parentChats = this.chatService.renderAllChats(response.json());
+      });
   }
 
 }
diff --git a/src/app/components/feed/feed.component.ts b/src/app/components/feed/feed.component.ts
index 06bc6ab..cc1c40e 100644
--- a/src/app/components/feed/feed.component.ts
+++ b/src/app/components/feed/feed.component.ts
@@ -9,16 +9,16 @@ import { Actionlist } from 'src/app/models/actionlist';
   styleUrls: ['./feed.component.sass']
 })
 export class FeedComponent implements OnInit {
-  checked: boolean //if the "I protected the environment."-box is checked
- //points value of the green action
-  value: any
-  viewNew: boolean = true
-  viewMostLiked: boolean = false
+  checked: boolean; // if the "I protected the environment."-box is checked
+ // points value of the green action
+  value: any;
+  viewNew = true;
+  viewMostLiked = false;
 
-  feedNew: Array<Post>
-  feedMostLiked: Array<Post>
+  feedNew: Array<Post>;
+  feedMostLiked: Array<Post>;
 
-  parentSelectedPostList: Array<Post>
+  parentSelectedPostList: Array<Post>;
 
   actionlist: Actionlist = new Actionlist();
 
@@ -26,46 +26,46 @@ export class FeedComponent implements OnInit {
 
   ngOnInit() {
     this.feedService.getAllPostsRaw().subscribe(response => {
-      this.feedNew = this.feedService.renderAllPosts(response.json())
-      this.parentSelectedPostList = this.feedNew
-      this.feedMostLiked = this.feedNew
-      console.log(this.feedNew)
-    })
+      this.feedNew = this.feedService.renderAllPosts(response.json());
+      this.parentSelectedPostList = this.feedNew;
+      this.feedMostLiked = this.feedNew;
+      console.log(this.feedNew);
+    });
   }
 
-  createPost(pElement){
-    this.feedService.createPost(pElement.value)
-    pElement.value = ""
+  createPost(pElement) {
+    this.feedService.createPost(pElement.value);
+    pElement.value = '';
     this.feedService.getAllPostsRaw().subscribe(response => {
-      this.feedNew = this.feedService.renderAllPosts(response.json())
-      this.parentSelectedPostList = this.feedNew
-      this.feedMostLiked = this.feedNew})
+      this.feedNew = this.feedService.renderAllPosts(response.json());
+      this.parentSelectedPostList = this.feedNew;
+      this.feedMostLiked = this.feedNew; });
   }
 
   showNew() {
-    console.log("showNew()")
+    console.log('showNew()');
     this.feedService.getAllPostsRaw().subscribe(response => {
-      this.feedNew = this.feedService.renderAllPosts(response.json())
-      this.parentSelectedPostList = this.feedNew})
-    this.viewNew = true
-    this.viewMostLiked = false
+      this.feedNew = this.feedService.renderAllPosts(response.json());
+      this.parentSelectedPostList = this.feedNew; });
+    this.viewNew = true;
+    this.viewMostLiked = false;
   }
 
   showMostLiked() {
-    console.log("showMostLiked()")
+    console.log('showMostLiked()');
     this.feedService.getAllPostsRaw().subscribe(response => {
-      this.feedMostLiked = this.feedService.renderAllPosts(response.json())
-      this.parentSelectedPostList = this.feedMostLiked})
-    this.viewNew = false
-    this.viewMostLiked = true
+      this.feedMostLiked = this.feedService.renderAllPosts(response.json());
+      this.parentSelectedPostList = this.feedMostLiked; });
+    this.viewNew = false;
+    this.viewMostLiked = true;
   }
 
-  
+
   refresh($event) {
     this.feedService.getAllPostsRaw().subscribe(response => {
-      this.parentSelectedPostList = this.feedService.renderAllPosts(response.json())
-      console.log("Refresh")
-    })
+      this.parentSelectedPostList = this.feedService.renderAllPosts(response.json());
+      console.log('Refresh');
+    });
   }
 
 }
diff --git a/src/app/components/feed/postlist/postlist.component.ts b/src/app/components/feed/postlist/postlist.component.ts
index 7c2b612..3d35997 100644
--- a/src/app/components/feed/postlist/postlist.component.ts
+++ b/src/app/components/feed/postlist/postlist.component.ts
@@ -9,9 +9,9 @@ import { FeedService } from 'src/app/services/feed/feed.service';
 })
 export class PostlistComponent implements OnInit {
 
-  @Input() childPostList: Array<Post>
-  @Output() voteEvent = new EventEmitter<boolean>()
-  selectedPost: Post
+  @Input() childPostList: Array<Post>;
+  @Output() voteEvent = new EventEmitter<boolean>();
+  selectedPost: Post;
 
   constructor(private feedService: FeedService) { }
 
@@ -20,12 +20,12 @@ export class PostlistComponent implements OnInit {
 
   voteUp(pPost: Post) {
     this.feedService.upvote(pPost.id).subscribe(response => {
-        this.voteEvent.emit(true)})
+        this.voteEvent.emit(true); });
   }
 
   voteDown(pPost: Post) {
     this.feedService.downvote(pPost.id).subscribe(response => {
-        this.voteEvent.emit(true)})
+        this.voteEvent.emit(true); });
   }
 
 }
diff --git a/src/app/components/home/home.component.ts b/src/app/components/home/home.component.ts
index fed6aed..9149fc1 100644
--- a/src/app/components/home/home.component.ts
+++ b/src/app/components/home/home.component.ts
@@ -9,15 +9,15 @@ import { FeedService } from 'src/app/services/feed/feed.service';
 })
 export class HomeComponent implements OnInit {
 
-  loggedIn: boolean
+  loggedIn: boolean;
 
   constructor(private data: DatasharingService, private feedService: FeedService) { }
 
   ngOnInit() {
     this.data.currentUserInfo.subscribe(user => {
       this.loggedIn = user.loggedIn;
-    })
-    this.feedService.getAllPosts()
+    });
+    this.feedService.getAllPosts();
   }
 
 }
diff --git a/src/app/components/login/login.component.ts b/src/app/components/login/login.component.ts
index d0c4e5d..6821abd 100644
--- a/src/app/components/login/login.component.ts
+++ b/src/app/components/login/login.component.ts
@@ -11,7 +11,7 @@ import * as sha512 from 'js-sha512';
   styleUrls: ['./login.component.sass']
 })
 export class LoginComponent implements OnInit {
-  login: Login
+  login: Login;
   hide = true;
   errorOccurred: boolean = false;
   errorMessage: string;
@@ -31,14 +31,14 @@ export class LoginComponent implements OnInit {
   }
 
   onClickSubmit(pEmail: string, pPasswordHash: string) {
-    console.log('try to login with mail adress:' + pEmail); 
+    console.log('try to login with mail adress:' + pEmail);
     this.errorOccurred = false;
     this.errorMessage = " ";
-    this.login.email = pEmail.trim()
+    this.login.email = pEmail.trim();
     this.login.passwordHash = sha512.sha512(pPasswordHash);
     console.log(this.login.passwordHash);
 
-    console.log(this.login.passwordHash)
+    console.log(this.login.passwordHash);
 
     this.loginService.login(this.login, error => this.loginError(error.json()));
   }
diff --git a/src/app/components/main-navigation/main-navigation.component.ts b/src/app/components/main-navigation/main-navigation.component.ts
index f97bb73..a16c49f 100644
--- a/src/app/components/main-navigation/main-navigation.component.ts
+++ b/src/app/components/main-navigation/main-navigation.component.ts
@@ -17,16 +17,20 @@ import { OverlayContainer} from '@angular/cdk/overlay';
   styleUrls: ['./main-navigation.component.sass']
 })
 export class MainNavigationComponent implements OnInit {
-  loggedIn: boolean = false
-  userId: number
-  username: string
-  user: User
-  levellist: Levellist = new Levellist()
-  level: string
-  points: number
-  profileUrl: string = "/profile/1"
 
-  lighttheme : boolean = true
+  constructor(public overlayContainer: OverlayContainer, private data: DatasharingService, private selfservice: SelfService, private breakpointObserver: BreakpointObserver, private http: Http, private router: Router) {
+    this.overlay = overlayContainer.getContainerElement();
+  }
+  loggedIn = false;
+  userId: number;
+  username: string;
+  user: User;
+  levellist: Levellist = new Levellist();
+  level: string;
+  points: number;
+  profileUrl = '/profile/1';
+
+  lighttheme = true;
   overlay;
 
   isHandset$: Observable<boolean> = this.breakpointObserver.observe(Breakpoints.Handset)
@@ -34,22 +38,6 @@ export class MainNavigationComponent implements OnInit {
       map(result => result.matches),
       shareReplay()
     );
-
-  constructor(public overlayContainer: OverlayContainer, private data: DatasharingService,private selfservice: SelfService,private breakpointObserver: BreakpointObserver, private http: Http, private router: Router) {
-    this.overlay = overlayContainer.getContainerElement();
-  }
-  ngOnInit() {
-    this.data.currentUserInfo.subscribe(user => {
-      this.user = user
-      this.loggedIn = user.loggedIn;
-      this.userId = user.userID;
-      this.username = user.username
-      this.level = this.levellist.getLevelName(user.level)
-      this.points = user.points
-      this.profileUrl = '/profile/' + this.userId;
-      this.updateLinks();
-    })    
-  }
   navLinksLoggedIn = [
     { path: '', label: 'Home' },
     { path: this.profileUrl, label: 'Profile' },
@@ -62,22 +50,36 @@ export class MainNavigationComponent implements OnInit {
     { path: '/imprint', label: 'Imprint' },
     { path: '/login', label: 'Login' },
   ];
-  
+
+  @HostBinding('class') componentCssClass;
+  ngOnInit() {
+    this.data.currentUserInfo.subscribe(user => {
+      this.user = user;
+      this.loggedIn = user.loggedIn;
+      this.userId = user.userID;
+      this.username = user.username;
+      this.level = this.levellist.getLevelName(user.level);
+      this.points = user.points;
+      this.profileUrl = '/profile/' + this.userId;
+      this.updateLinks();
+    });
+  }
+
   toggleTheme() {
-    if (this.overlay.classList.contains("dark-theme")) {
-        this.overlay.classList.remove("dark-theme");
-        this.overlay.classList.add("light-theme");
-        this.onSetTheme("light-theme");
-    } else if (this.overlay.classList.contains("light-theme")) {
-        this.overlay.classList.remove("light-theme");
-        this.overlay.classList.add("dark-theme");
-        this.onSetTheme("dark-theme");
+    if (this.overlay.classList.contains('dark-theme')) {
+        this.overlay.classList.remove('dark-theme');
+        this.overlay.classList.add('light-theme');
+        this.onSetTheme('light-theme');
+    } else if (this.overlay.classList.contains('light-theme')) {
+        this.overlay.classList.remove('light-theme');
+        this.overlay.classList.add('dark-theme');
+        this.onSetTheme('dark-theme');
     } else {
-        this.overlay.classList.add("dark-theme");
-        this.onSetTheme("dark-theme");
+        this.overlay.classList.add('dark-theme');
+        this.onSetTheme('dark-theme');
     }
   }
-  updateLinks(){
+  updateLinks() {
     this.navLinksLoggedIn = [
       { path: '', label: 'Home' },
       { path: this.profileUrl, label: 'Profile' },
@@ -85,28 +87,26 @@ export class MainNavigationComponent implements OnInit {
       { path: '/imprint', label: 'Imprint' },
     ];
   }
-
-  @HostBinding('class') componentCssClass;
   onSetTheme(theme) {
     this.overlayContainer.getContainerElement().classList.add(theme);
     this.componentCssClass = theme;
   }
   logout() {
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
 
     const body = {query: `mutation {
         logout
-      }`}
- 
+      }`};
+
     this.http.post(url, body).subscribe(response => {
-        console.log(response.text())})
-    this.loggedIn = false
-    let user = new User()
-    user.loggedIn = false
-    this.data.changeUserInfo(user)
-    this.router.navigate(['login'])
+        console.log(response.text()); });
+    this.loggedIn = false;
+    const user = new User();
+    user.loggedIn = false;
+    this.data.changeUserInfo(user);
+    this.router.navigate(['login']);
   }
 }
diff --git a/src/app/components/profile/profile.component.ts b/src/app/components/profile/profile.component.ts
index 6bb5708..a9006cb 100644
--- a/src/app/components/profile/profile.component.ts
+++ b/src/app/components/profile/profile.component.ts
@@ -15,28 +15,28 @@ import {MatTableDataSource} from '@angular/material/table';
 })
 
 export class ProfileComponent implements OnInit {
-  actionlist: Actionlist = new Actionlist()
-  
-  levellist: Levellist = new Levellist()
-  user: User = new User()
-  id : string
-  rankname: string
-  profileNotFound : boolean = false
-  displayedColumns = ['points', 'name']
-  dataSource = new MatTableDataSource(this.actionlist.Actions)
-  displayedLevelColumns = ['level', 'name']
-  levelSource = this.levellist.levels
-  constructor(private router: Router,private http: Http) { }
-  
+  actionlist: Actionlist = new Actionlist();
+
+  levellist: Levellist = new Levellist();
+  user: User = new User();
+  id: string;
+  rankname: string;
+  profileNotFound = false;
+  displayedColumns = ['points', 'name'];
+  dataSource = new MatTableDataSource(this.actionlist.Actions);
+  displayedLevelColumns = ['level', 'name'];
+  levelSource = this.levellist.levels;
+  constructor(private router: Router, private http: Http) { }
+
   @ViewChild(MatSort, {static: true}) sort: MatSort;
   ngOnInit() {
     this.dataSource.sort = this.sort;
-    this.id = this.router.url.substr(this.router.url.lastIndexOf("/") + 1);
-    //let url = './graphql'
-    let url = environment.graphQLUrl
-    let headers = new Headers();
+    this.id = this.router.url.substr(this.router.url.lastIndexOf('/') + 1);
+    // let url = './graphql'
+    const url = environment.graphQLUrl;
+    const headers = new Headers();
     headers.set('Content-Type', 'application/json');
- 
+
     return this.http.post(url, this.buildJson(this.id))
       .subscribe(response => {
         console.log(response.text());
@@ -45,8 +45,8 @@ export class ProfileComponent implements OnInit {
       );
   }
 
-  public updateUserInfo(response : any){
-    if(response.data.getUser != null){
+  public updateUserInfo(response: any) {
+    if (response.data.getUser != null) {
       this.profileNotFound = false;
       this.user.loggedIn = true;
       this.user.userID = response.data.getUser.id;
@@ -56,7 +56,7 @@ export class ProfileComponent implements OnInit {
       this.user.level = response.data.getUser.level;
       this.rankname = this.levellist.getLevelName(this.user.level);
       this.user.friendIDs = response.data.getUser.friends;
-    } else{
+    } else {
       this.profileNotFound = true;
     }
   }
@@ -69,17 +69,17 @@ export class ProfileComponent implements OnInit {
         name
         profilePicture
         points
-        level    
+        level
         friendCount
         friends{
           id
         }
         posts{
           content
-        }   
+        }
       }
     }`, variables: {
-        userId: this.id 
+        userId: this.id
       }};
     return body;
   }
diff --git a/src/app/components/register/register.component.ts b/src/app/components/register/register.component.ts
index efdb425..92af91e 100644
--- a/src/app/components/register/register.component.ts
+++ b/src/app/components/register/register.component.ts
@@ -12,40 +12,40 @@ import * as sha512 from 'js-sha512';
   styleUrls: ['./register.component.sass']
 })
 export class RegisterComponent implements OnInit {
-  registration: Registration 
-  errorOccurred: boolean = false;
+  registration: Registration;
+  errorOccurred = false;
   errorMessage: string;
   hide1 = true;
   hide2 = true;
- 
+
   constructor(private registerService: RegisterService) {
     this.registration = {username: null, passwordHash: null, email: null};
   }
 
-  public registerError(error : any){
+  public registerError(error: any) {
     console.log(error.errors[0].message);
     this.errorOccurred = true;
     this.errorMessage = error.errors[0].message;
   }
 
-  onClickSubmit(pUsername: string, pEmail: string, pPasswordHash: string,pPasswordHashRepeat: string ) {
+  onClickSubmit(pUsername: string, pEmail: string, pPasswordHash: string, pPasswordHashRepeat: string ) {
     this.errorOccurred = false;
-    this.errorMessage = " ";
-    if(this.passwordSame(pPasswordHash,pPasswordHashRepeat)){
-      this.registration.username = pUsername.trim()
-      this.registration.email = pEmail.trim()
+    this.errorMessage = ' ';
+    if (this.passwordSame(pPasswordHash, pPasswordHashRepeat)) {
+      this.registration.username = pUsername.trim();
+      this.registration.email = pEmail.trim();
       this.registration.passwordHash = sha512.sha512(pPasswordHash);
       this.registerService.register(this.registration, error => this.registerError(error.json()));
     }
   }
 
-  passwordSame(pwd: string,pwd2: string){
-    if(pwd == pwd2){
-      console.log('password same'); 
+  passwordSame(pwd: string, pwd2: string) {
+    if (pwd == pwd2) {
+      console.log('password same');
       return true;
-    } else{
+    } else {
       this.errorOccurred = true;
-      this.errorMessage = "not the same password";
+      this.errorMessage = 'not the same password';
       return false;
     }
   }
diff --git a/src/app/components/social/friends/friends.component.ts b/src/app/components/social/friends/friends.component.ts
index 4ed3d36..8c73890 100644
--- a/src/app/components/social/friends/friends.component.ts
+++ b/src/app/components/social/friends/friends.component.ts
@@ -12,30 +12,30 @@ import { environment } from 'src/environments/environment';
 })
 export class FriendsComponent implements OnInit {
 
-  friendIDs: number[] = [29, 27, 30, 31]
-  friends = new Array<FriendInfo>() //= ["Friend 1", "Friend 2", "Friend 3", "Friend 4", "Friend 5", "Friend 6"]
+  friendIDs: number[] = [29, 27, 30, 31];
+  friends = new Array<FriendInfo>(); // = ["Friend 1", "Friend 2", "Friend 3", "Friend 4", "Friend 5", "Friend 6"]
 
   constructor(private data: DatasharingService, private http: Http, private router: Router) { }
 
   ngOnInit() {
-    //this.data.currentUserInfo.subscribe(user => {
+    // this.data.currentUserInfo.subscribe(user => {
     //  this.friendIDs = user.friendIDs})
-    this.getFriendsNames()
+    this.getFriendsNames();
   }
 
   getFriendsNames() {
-    for(let id of this.friendIDs) {
-      let url = environment.graphQLUrl
-      let headers = new Headers();
+    for (const id of this.friendIDs) {
+      const url = environment.graphQLUrl;
+      const headers = new Headers();
       headers.set('Content-Type', 'application/json');
-  
+
       this.http.post(url, this.buildJson(id))
-        .subscribe(response => {this.readOutFriendsNames(id, response.json())})
+        .subscribe(response => {this.readOutFriendsNames(id, response.json()); });
       }
   }
 
-  readOutFriendsNames(pId: number, pResponse : any) {
-    this.friends.push(new FriendInfo(pId, pResponse.data.getUser.name,pResponse.data.getUser.level ))
+  readOutFriendsNames(pId: number, pResponse: any) {
+    this.friends.push(new FriendInfo(pId, pResponse.data.getUser.name, pResponse.data.getUser.level ));
   }
 
   buildJson(pId: number): any {
@@ -45,14 +45,14 @@ export class FriendsComponent implements OnInit {
         level
       }
     }`, variables: {
-        userId: pId 
-      }}
+        userId: pId
+      }};
 
-    return body
+    return body;
   }
 
-  public showFriendProfile(pFriend: FriendInfo){
-    this.router.navigate(['profile/' + pFriend.id])
+  public showFriendProfile(pFriend: FriendInfo) {
+    this.router.navigate(['profile/' + pFriend.id]);
   }
 
 }
diff --git a/src/app/components/social/groups/groups.component.ts b/src/app/components/social/groups/groups.component.ts
index cb7b7f6..dc4fa74 100644
--- a/src/app/components/social/groups/groups.component.ts
+++ b/src/app/components/social/groups/groups.component.ts
@@ -7,7 +7,7 @@ import { GroupInfo } from 'src/app/models/groupinfo';
   styleUrls: ['./groups.component.sass']
 })
 export class GroupsComponent implements OnInit {
-  groups: Array<GroupInfo> = [new GroupInfo(1,"Group 1",[]), new GroupInfo(1,"Group 2",[]), new GroupInfo(1,"Group 3",[]), new GroupInfo(1,"Group 4",[])]
+  groups: Array<GroupInfo> = [new GroupInfo(1, 'Group 1', []), new GroupInfo(1, 'Group 2', []), new GroupInfo(1, 'Group 3', []), new GroupInfo(1, 'Group 4', [])];
   constructor() { }
 
   ngOnInit() {
diff --git a/src/app/graphql.module.ts b/src/app/graphql.module.ts
index 3942184..24eaacf 100644
--- a/src/app/graphql.module.ts
+++ b/src/app/graphql.module.ts
@@ -4,7 +4,7 @@ import {HttpLinkModule, HttpLink} from 'apollo-angular-link-http';
 import {InMemoryCache} from 'apollo-cache-inmemory';
 
 const uri = 'https://o5x5jzoo7z.sse.codesandbox.io/graphql';
-//'https://greenvironment.net/graphql:443'; // <-- add the URL of the GraphQL server here
+// 'https://greenvironment.net/graphql:443'; // <-- add the URL of the GraphQL server here
 export function createApollo(httpLink: HttpLink) {
   return {
     link: httpLink.create({uri}),
diff --git a/src/app/models/actionlist.ts b/src/app/models/actionlist.ts
index a7ef6f3..aa072a4 100644
--- a/src/app/models/actionlist.ts
+++ b/src/app/models/actionlist.ts
@@ -1,23 +1,23 @@
 
 export interface Action {
-  id: number
+  id: number;
   name: string;
   points: number;
 }
 
-export class Actionlist{
+export class Actionlist {
 
      Actions: Action[] = [
-      { id: 0, name: "collect a lot of trash",points: 25},
-      { id: 1, name: "collect a bit of trash",points: 10 },
-      { id: 2, name: "do trash seperation", points: 5 },
-      { id: 3, name: "plant a tree", points: 2 },
-      { id: 4, name: "beautify your surroundings", points: 8 },
-      { id: 5, name: "reduce waste", points: 5 },
-      { id: 6, name: "reduce CO2 emission", points: 5 },
-      { id: 7, name: "eat a vegetarian meal", points: 2 },
-      { id: 8, name: "don't use the car", points: 10 },
-      { id: 9, name: "buy a fair trade / local product", points: 1 },
-      { id: 10, name: "donate money to an environment organisation ", points: 10 },
+      { id: 0, name: 'collect a lot of trash', points: 25},
+      { id: 1, name: 'collect a bit of trash', points: 10 },
+      { id: 2, name: 'do trash seperation', points: 5 },
+      { id: 3, name: 'plant a tree', points: 2 },
+      { id: 4, name: 'beautify your surroundings', points: 8 },
+      { id: 5, name: 'reduce waste', points: 5 },
+      { id: 6, name: 'reduce CO2 emission', points: 5 },
+      { id: 7, name: 'eat a vegetarian meal', points: 2 },
+      { id: 8, name: 'don\'t use the car', points: 10 },
+      { id: 9, name: 'buy a fair trade / local product', points: 1 },
+      { id: 10, name: 'donate money to an environment organisation ', points: 10 },
     ];
-}
\ No newline at end of file
+}
diff --git a/src/app/models/author.ts b/src/app/models/author.ts
index f5f9965..3fa8e67 100644
--- a/src/app/models/author.ts
+++ b/src/app/models/author.ts
@@ -1,11 +1,11 @@
 export class Author {
-    id: number
-    name: string
-    handle: string
+    id: number;
+    name: string;
+    handle: string;
 
     constructor(pId: number, pName: string, pHandle: string) {
-        this.id = pId
-        this.name = pName
-        this.handle = pHandle
+        this.id = pId;
+        this.name = pName;
+        this.handle = pHandle;
     }
-}
\ No newline at end of file
+}
diff --git a/src/app/models/chat.ts b/src/app/models/chat.ts
index 5af6bdc..b35ed7c 100644
--- a/src/app/models/chat.ts
+++ b/src/app/models/chat.ts
@@ -1,16 +1,16 @@
-import { Chatmessage } from "./chatmessage"
+import { Chatmessage } from './chatmessage';
 
 export class Chat {
-    id: number
-    memberID: number
-    memberName: string
-    messages: Array<Chatmessage>
-    
+    id: number;
+    memberID: number;
+    memberName: string;
+    messages: Array<Chatmessage>;
+
 
     constructor(pId: number, pMemberID: number, pMemberName: string, pMessages: Array<Chatmessage>) {
-        this.id = pId
-        this.memberID = pMemberID
-        this.memberName = pMemberName
-        this.messages = pMessages
+        this.id = pId;
+        this.memberID = pMemberID;
+        this.memberName = pMemberName;
+        this.messages = pMessages;
     }
-}
\ No newline at end of file
+}
diff --git a/src/app/models/chatinfo.ts b/src/app/models/chatinfo.ts
index 0670a21..89a13eb 100644
--- a/src/app/models/chatinfo.ts
+++ b/src/app/models/chatinfo.ts
@@ -3,7 +3,7 @@ export class Chatinfo {
     date: string;
 
     constructor(pId: string, pDate: string) {
-        this.id = pId
-        this.date = pDate
+        this.id = pId;
+        this.date = pDate;
     }
-}
\ No newline at end of file
+}
diff --git a/src/app/models/chatmessage.ts b/src/app/models/chatmessage.ts
index a2a4910..291a840 100644
--- a/src/app/models/chatmessage.ts
+++ b/src/app/models/chatmessage.ts
@@ -1,11 +1,11 @@
 export class Chatmessage {
-    content: string
-    date: string
-    myself: boolean
+    content: string;
+    date: string;
+    myself: boolean;
 
     constructor(pContent: string, pDate: string, pMyself: boolean) {
-        this.content = pContent
-        this.date = pDate
-        this.myself = pMyself
+        this.content = pContent;
+        this.date = pDate;
+        this.myself = pMyself;
     }
-}
\ No newline at end of file
+}
diff --git a/src/app/models/friendinfo.ts b/src/app/models/friendinfo.ts
index e6c9d24..5a6659c 100644
--- a/src/app/models/friendinfo.ts
+++ b/src/app/models/friendinfo.ts
@@ -2,13 +2,13 @@ import { Levellist } from 'src/app/models/levellist';
 
 export class FriendInfo {
     levellist: Levellist = new Levellist();
-    id: number
-    name: string
-    rankname: string
+    id: number;
+    name: string;
+    rankname: string;
 
     constructor(pId: number, pName: string, pLevel: number) {
-        this.id = pId
-        this.name = pName
+        this.id = pId;
+        this.name = pName;
         this.rankname = this.levellist.getLevelName(pLevel);
     }
-}
\ No newline at end of file
+}
diff --git a/src/app/models/groupinfo.ts b/src/app/models/groupinfo.ts
index 43e5a28..9220e21 100644
--- a/src/app/models/groupinfo.ts
+++ b/src/app/models/groupinfo.ts
@@ -1,11 +1,11 @@
 export class GroupInfo {
-    id: number
-    name: string
-    members: number[]
+    id: number;
+    name: string;
+    members: number[];
 
     constructor(pId: number, pName: string, pMembers: number[]) {
-        this.id = pId
-        this.name = pName
-        this.members = pMembers
+        this.id = pId;
+        this.name = pName;
+        this.members = pMembers;
     }
-}
\ No newline at end of file
+}
diff --git a/src/app/models/levellist.ts b/src/app/models/levellist.ts
index 29eca03..45c4692 100644
--- a/src/app/models/levellist.ts
+++ b/src/app/models/levellist.ts
@@ -1,22 +1,22 @@
-export class Levellist{
+export class Levellist {
     levels: {level: number, name: string, points: number}[] = [
-      {level: 0, name: "Green Horn",points: 0},
-      {level: 1, name: "Good Willed",points: 100 },
-      {level: 2, name: "Helper", points: 200 },
-      {level: 3, name: "World Saver", points: 300 },
-      {level: 4, name: "Hero of the Green Country", points: 400 },
-      {level: 5, name: "Champion of the Earth", points: 500 },
-      {level: 6, name: "Intergallactic Superhero", points: 600 },
+      {level: 0, name: 'Green Horn', points: 0},
+      {level: 1, name: 'Good Willed', points: 100 },
+      {level: 2, name: 'Helper', points: 200 },
+      {level: 3, name: 'World Saver', points: 300 },
+      {level: 4, name: 'Hero of the Green Country', points: 400 },
+      {level: 5, name: 'Champion of the Earth', points: 500 },
+      {level: 6, name: 'Intergallactic Superhero', points: 600 },
     ];
 
-  getLevelName(lev:number): any{
-    var name: string = 'not defined';
+  getLevelName(lev: number): any {
+    let name = 'not defined';
     this.levels.forEach(rank => {
-      if(lev == rank.level){
+      if (lev == rank.level) {
         name = rank.name;
-      } 
+      }
     });
-    return name
+    return name;
   }
 
-}
\ No newline at end of file
+}
diff --git a/src/app/models/login.ts b/src/app/models/login.ts
index f44e6e0..709d49b 100644
--- a/src/app/models/login.ts
+++ b/src/app/models/login.ts
@@ -1,6 +1,6 @@
-import { Hash } from "crypto";
+import { Hash } from 'crypto';
 
 export interface Login {
     email: string;
-    passwordHash: string
-  }
\ No newline at end of file
+    passwordHash: string;
+  }
diff --git a/src/app/models/post.ts b/src/app/models/post.ts
index 9036448..0271d27 100644
--- a/src/app/models/post.ts
+++ b/src/app/models/post.ts
@@ -1,23 +1,23 @@
-import { Author } from "./author"
+import { Author } from './author';
 
 export class Post {
-    id: number
-    content: string
-    htmlContent: string
-    date: string
-    upvotes: number
-    downvotes: number
-    userVote: string
-    author: Author
+    id: number;
+    content: string;
+    htmlContent: string;
+    date: string;
+    upvotes: number;
+    downvotes: number;
+    userVote: string;
+    author: Author;
 
     constructor(pId: number, pContent: string, pHtmlContent: string, pUpvotes: number, pDownvotes: number, pUserVote: string, pDate: string, pAuthor: Author) {
-        this.id = pId
-        this.content = pContent
-        this.htmlContent = pHtmlContent
-        this.upvotes = pUpvotes
-        this.downvotes = pDownvotes
-        this.userVote = pUserVote
-        this.date = pDate
-        this.author = pAuthor
+        this.id = pId;
+        this.content = pContent;
+        this.htmlContent = pHtmlContent;
+        this.upvotes = pUpvotes;
+        this.downvotes = pDownvotes;
+        this.userVote = pUserVote;
+        this.date = pDate;
+        this.author = pAuthor;
     }
-}
\ No newline at end of file
+}
diff --git a/src/app/models/registration.ts b/src/app/models/registration.ts
index ff4b1a2..96166b5 100644
--- a/src/app/models/registration.ts
+++ b/src/app/models/registration.ts
@@ -1,5 +1,5 @@
 export interface Registration {
     username: string;
     email: string;
-    passwordHash: string
-  }
\ No newline at end of file
+    passwordHash: string;
+  }
diff --git a/src/app/models/user.ts b/src/app/models/user.ts
index 619d6b7..3b073b6 100644
--- a/src/app/models/user.ts
+++ b/src/app/models/user.ts
@@ -1,15 +1,15 @@
 export class User {
-  loggedIn : boolean
-  userID : number
-  username : string
-  handle : string
-  email : string
-  points : number
-  level : number
-
-  friendIDs : number[]
-  groupIDs : number[]
-  chatIDs : number[]
-
-  requestIDs : number[]
-}
\ No newline at end of file
+  constructor(
+    public userID: number,
+    public loggedIn: boolean,
+    public username: string,
+    public handle: string,
+    public email: string,
+    public points: number,
+    public level: number,
+    public friendIDs: number[],
+    public groupIDs: number[],
+    public chatIDs: number[],
+    public requestIDs: number[],
+  ) {}
+}
diff --git a/src/app/services/chat/chat.service.ts b/src/app/services/chat/chat.service.ts
index 5121f10..5d22553 100644
--- a/src/app/services/chat/chat.service.ts
+++ b/src/app/services/chat/chat.service.ts
@@ -12,212 +12,211 @@ import { environment } from 'src/environments/environment';
 })
 export class ChatService {
 
-  arr: number[]
-  ownID: number
-  chats: Array<Chat> = []
+  arr: number[];
+  ownID: number;
+  chats: Array<Chat> = [];
 
   constructor(private http: Http, private data: DatasharingService) {
     this.data.currentUserInfo.subscribe(user => {
-      this.ownID = user.userID})
+      this.ownID = user.userID; });
    }
 
   public getAllChats(): Array<Chat> {
-    console.log("Getting all chats ..")
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
- 
+    console.log('Getting all chats ..');
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
+
     this.http.post(url, this.getBodyForGetAllChats())
     .subscribe(response => {
-        this.chats = this.renderAllChats(response.json())
+        this.chats = this.renderAllChats(response.json());
       });
-    return this.chats
+    return this.chats;
   }
 
   public getAllChatsRaw(): any {
-    console.log("Getting all chats ..")
-    let url = 'https://greenvironment.net/graphql'
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
- 
-    return this.http.post(url, this.getBodyForGetAllChats())
+    console.log('Getting all chats ..');
+    const url = 'https://greenvironment.net/graphql';
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
+
+    return this.http.post(url, this.getBodyForGetAllChats());
   }
 
   public getChatsByID(pChatIDs: number[]): Array<Chat> {
-    this.chats = []
-    console.log("Getting chats by ID..")
+    this.chats = [];
+    console.log('Getting chats by ID..');
+
+    for (const chatId of pChatIDs) {
+      const url = environment.graphQLUrl;
 
-    for(let chatId of pChatIDs) {
-      let url = environment.graphQLUrl
-  
-      let headers = new Headers()
-      headers.set('Content-Type', 'application/json')
+      const headers = new Headers();
+      headers.set('Content-Type', 'application/json');
 
       this.http.post(url, this.getBodyForGetChatsByID(chatId))
       .subscribe(response => {
-        this.updateChat(response.json())
-      })
+        this.updateChat(response.json());
+      });
     }
-    return this.chats
+    return this.chats;
   }
 
   public getChatsByIDRaw(pChatIDs: number[]): any {
-    console.log("Getting chats by ID..")
+    console.log('Getting chats by ID..');
 
-    for(let chatId of pChatIDs) {
-      let url = 'https://greenvironment.net/graphql'
-  
-      let headers = new Headers()
-      headers.set('Content-Type', 'application/json')
+    for (const chatId of pChatIDs) {
+      const url = 'https://greenvironment.net/graphql';
+
+      const headers = new Headers();
+      headers.set('Content-Type', 'application/json');
 
       this.http.post(url, this.getBodyForGetChatsByID(chatId))
       .subscribe(response => {
-        this.updateChat(response.json())
-      })
+        this.updateChat(response.json());
+      });
     }
-    return this.chats
+    return this.chats;
   }
 
   public createNewChat(pUserID: number) {
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
- 
-    this.http.post(url, this.getBodyForNewChat(pUserID))
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
+
+    this.http.post(url, this.getBodyForNewChat(pUserID));
   }
 
   public requestAllChatPartners(): Array<FriendInfo> {
-    let url = environment.graphQLUrl
-    let chatPartners: Array<FriendInfo>
-    let temp
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
- 
+    const url = environment.graphQLUrl;
+    let chatPartners: Array<FriendInfo>;
+    let temp;
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
+
     this.http.post(url, this.getBodyForRequestOfAllChatPartners())
     .subscribe(response => {
-      temp = response.json()
-    })
-
-    for(let chat of temp.data.getSelf.chats) {
-      let memberID: number
-      let memberName: string
-      let memberLevel: number
-      for(let member of chat.members) {
-        if(member.id != this.ownID) {
-          memberID = member.id
-          memberName = member.name
-          memberLevel = member.level
+      temp = response.json();
+    });
+
+    for (const chat of temp.data.getSelf.chats) {
+      let memberID: number;
+      let memberName: string;
+      let memberLevel: number;
+      for (const member of chat.members) {
+        if (member.id != this.ownID) {
+          memberID = member.id;
+          memberName = member.name;
+          memberLevel = member.level;
         }
       }
-      chatPartners.push(new FriendInfo(memberID, memberName, memberLevel))
+      chatPartners.push(new FriendInfo(memberID, memberName, memberLevel));
     }
 
-    return chatPartners
+    return chatPartners;
   }
 
   public sendMessage(pChatID: number, pContent: string): any {
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
- 
-    return this.http.post(url, this.getBodyForSendMessage(pChatID, pContent))
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
+
+    return this.http.post(url, this.getBodyForSendMessage(pChatID, pContent));
   }
 
   public getMessages(pChatID): Array<Chatmessage> {
-    let messages: Array<Chatmessage>
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
- 
-    this.http.post(url, this.getBodyForGetMessagesInChat(pChatID)).subscribe(response => 
-      {
-        console.log("Downloading messages ...")
-        messages = this.renderMessages(response.json())
-      })
-    return messages
+    let messages: Array<Chatmessage>;
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
+
+    this.http.post(url, this.getBodyForGetMessagesInChat(pChatID)).subscribe(response => {
+        console.log('Downloading messages ...');
+        messages = this.renderMessages(response.json());
+      });
+    return messages;
   }
 
   public getMessagesRaw(pChatID): any {
-    let url = 'https://greenvironment.net/graphql'
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
- 
-    return this.http.post(url, this.getBodyForGetMessagesInChat(pChatID))
+    const url = 'https://greenvironment.net/graphql';
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
+
+    return this.http.post(url, this.getBodyForGetMessagesInChat(pChatID));
   }
 
   public renderMessages(pResponse: any): Array<Chatmessage> {
-    let messages = new Array<Chatmessage>()
-      for(let message of pResponse.data.getChat.messages) {
-        if(message.author.id == this.ownID) {
-          messages.push(new Chatmessage(message.content, message.createdAt, true))
+    const messages = new Array<Chatmessage>();
+      for (const message of pResponse.data.getChat.messages) {
+        if (message.author.id == this.ownID) {
+          messages.push(new Chatmessage(message.content, message.createdAt, true));
         } else {
-          messages.push(new Chatmessage(message.content, message.createdAt, false))
+          messages.push(new Chatmessage(message.content, message.createdAt, false));
         }
       }
-    return messages
+    return messages;
   }
 
   public renderAllChats(pResponse: any): Array<Chat> {
-    let chats = Array<Chat>()
-    for(let chat of pResponse.data.getSelf.chats) {
-      let memberID: number
-      let memberName: string
-      for(let member of chat.members) {
-        if(member.id != this.ownID) {
-          memberID = member.id
-          memberName = member.name
+    const chats = Array<Chat>();
+    for (const chat of pResponse.data.getSelf.chats) {
+      let memberID: number;
+      let memberName: string;
+      for (const member of chat.members) {
+        if (member.id != this.ownID) {
+          memberID = member.id;
+          memberName = member.name;
         }
       }
-      let messages = new Array<Chatmessage>()
-      for(let message of chat.messages) {
-        if(message.author.id == this.ownID) {
-          messages.push(new Chatmessage(message.content, message.createdAt, true))
+      const messages = new Array<Chatmessage>();
+      for (const message of chat.messages) {
+        if (message.author.id == this.ownID) {
+          messages.push(new Chatmessage(message.content, message.createdAt, true));
         } else {
-          messages.push(new Chatmessage(message.content, message.createdAt, false))
+          messages.push(new Chatmessage(message.content, message.createdAt, false));
         }
       }
-      chats.push(new Chat(chat.id, memberID, memberName, messages))
+      chats.push(new Chat(chat.id, memberID, memberName, messages));
     }
-    return chats
+    return chats;
   }
 
   updateChat(pResponse: any) {
-    let id = pResponse.data.getChat.id
-    let memberId : number
-    let memberName: string
-    for(let member of pResponse.data.getChat.members) {
-      if(member.id != this.ownID) {
-        memberId = member.id
-        memberName = member.name
+    const id = pResponse.data.getChat.id;
+    let memberId: number;
+    let memberName: string;
+    for (const member of pResponse.data.getChat.members) {
+      if (member.id != this.ownID) {
+        memberId = member.id;
+        memberName = member.name;
       }
     }
-    let messages = new Array<Chatmessage>()
-    for(let message of pResponse.data.getChat.messages) {
-      if(message.author.id == this.ownID) {
-        messages.push(new Chatmessage(message.content, message.createdAt, true))
+    const messages = new Array<Chatmessage>();
+    for (const message of pResponse.data.getChat.messages) {
+      if (message.author.id == this.ownID) {
+        messages.push(new Chatmessage(message.content, message.createdAt, true));
       } else {
-        messages.push(new Chatmessage(message.content, message.createdAt, false))
+        messages.push(new Chatmessage(message.content, message.createdAt, false));
       }
     }
-    this.chats.push(new Chat(id, memberId, memberName, messages))
+    this.chats.push(new Chat(id, memberId, memberName, messages));
   }
 
   getBodyForNewChat(pUserID: number) {
-    this.arr = [pUserID]
+    this.arr = [pUserID];
     const body =  {query: `mutation($userID: number[]) {
-        createChat(members: $userID) {id} 
+        createChat(members: $userID) {id}
       }`, variables: {
           members: this.arr
       }};
 
-      return body
+      return body;
   }
 
   getBodyForRequestOfAllChatPartners() {
@@ -225,46 +224,46 @@ export class ChatService {
         getSelf {
           chats(first: 1000, offset: 0) {members{name, id, level}}
         }}`
-      }
+      };
 
-      return body
+      return body;
   }
 
   getBodyForSendMessage(pchatID: number, pContent: string) {
     const body =  {query: `mutation($chatId: ID!, $content: String!) {
-        sendMessage(chatId: $chatId, content: $content) {id} 
+        sendMessage(chatId: $chatId, content: $content) {id}
       }`, variables: {
           chatId: pchatID,
           content: pContent
       }};
 
-      return body
+      return body;
   }
 
   getBodyForGetAllChats() {
     const body =  {query: `query {
         getSelf {
           chats(first: 1000, offset: 0) {
-            id, members{name, id, level}, 
+            id, members{name, id, level},
             messages(first: 1000, offset: 0) {
               author {id}, createdAt, content
             }
           }
         }
       }`
-      }
-    return body
+      };
+    return body;
   }
 
   getBodyForGetChatsByID(pChatID: number) {
     const body =  {query: `query($chatID: ID!) {
-        getChat(chatId: $chatID) {id, members{name, id, level}, 
+        getChat(chatId: $chatID) {id, members{name, id, level},
           messages(first: 1000, offset: 0) {author {id}, createdAt, content}}
         }
       }`, variables: {
           chatId: pChatID
-      }}
-    return body
+      }};
+    return body;
   }
 
   getBodyForGetMessagesInChat(pChatID: number) {
@@ -274,7 +273,7 @@ export class ChatService {
         }
       }`, variables: {
           chatId: pChatID
-      }}
-    return body
+      }};
+    return body;
   }
 }
diff --git a/src/app/services/datasharing.service.ts b/src/app/services/datasharing.service.ts
index d9f3916..8798f16 100644
--- a/src/app/services/datasharing.service.ts
+++ b/src/app/services/datasharing.service.ts
@@ -7,18 +7,18 @@ import { User } from '../models/user';
 })
 export class DatasharingService {
 
-  private userInfoSource = new BehaviorSubject<User>(new User())
-  private chatIDsSource = new BehaviorSubject<number[]>(new Array<number>())
-  currentUserInfo = this.userInfoSource.asObservable()
-  currentChatIDs = this.chatIDsSource.asObservable()
+  private userInfoSource = new BehaviorSubject<User>(new User());
+  private chatIDsSource = new BehaviorSubject<number[]>(new Array<number>());
+  currentUserInfo = this.userInfoSource.asObservable();
+  currentChatIDs = this.chatIDsSource.asObservable();
 
   constructor() { }
 
   changeUserInfo(pUserInfo: User) {
-    this.userInfoSource.next(pUserInfo)
+    this.userInfoSource.next(pUserInfo);
   }
 
   changeChatIDs(pChatIDs: number[]) {
-    this.chatIDsSource.next(pChatIDs)
+    this.chatIDsSource.next(pChatIDs);
   }
 }
diff --git a/src/app/services/feed/feed.service.ts b/src/app/services/feed/feed.service.ts
index f0bb6ed..2b57a20 100644
--- a/src/app/services/feed/feed.service.ts
+++ b/src/app/services/feed/feed.service.ts
@@ -9,117 +9,117 @@ import { environment } from 'src/environments/environment';
 })
 export class FeedService {
 
-  posts: Array<Post>
+  posts: Array<Post>;
 
   constructor(private http: Http) { }
 
-  public createPost(pContent: String){
-    let url = environment.graphQLUrl
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
+  public createPost(pContent: String) {
+    const url = environment.graphQLUrl;
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
 
     const body = {query: `mutation($content: String!) {
         createPost(content: $content) {id}
       }`, variables: {
           content: pContent
-      }}
- 
+      }};
+
     this.http.post(url, body).subscribe(response => {
-        console.log(response.text())})
+        console.log(response.text()); });
   }
 
-  public createPost2(pContent: String){
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
+  public createPost2(pContent: String) {
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
 
     const body = {query: `query{
         getSelf {name}
-      }`}
- 
+      }`};
+
     this.http.post(url, body).subscribe(response => {
-        console.log(response.text())})
+        console.log(response.text()); });
   }
 
   public upvote(pPostID: number): any {
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
 
     const body = {query: `mutation($postId: ID!) {
         vote(postId: $postId, type: UPVOTE)
       }`, variables: {
           postId: pPostID
-      }}
- 
-    return this.http.post(url, body)
+      }};
+
+    return this.http.post(url, body);
   }
 
   public downvote(pPostID: number): any {
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
 
     const body = {query: `mutation($postId: ID!) {
         vote(postId: $postId, type: DOWNVOTE)
       }`, variables: {
           postId: pPostID
-      }}
- 
-    return this.http.post(url, body)
+      }};
+
+    return this.http.post(url, body);
   }
 
   public getAllPosts(): Array<Post> {
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
- 
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
+
     this.http.post(url, this.getBodyForGetAllPosts())
     .subscribe(response => {
-        this.posts = this.renderAllPosts(response.json())
-        console.log(response)
+        this.posts = this.renderAllPosts(response.json());
+        console.log(response);
       });
-    return this.posts
+    return this.posts;
   }
 
   public getAllPostsRaw(): any {
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers()
-    headers.set('Content-Type', 'application/json')
- 
-    return this.http.post(url, this.getBodyForGetAllPosts())
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
+    headers.set('Content-Type', 'application/json');
+
+    return this.http.post(url, this.getBodyForGetAllPosts());
   }
 
   getBodyForGetAllPosts() {
     const body =  {query: `query {
         getPosts (first: 1000, offset: 0) {id, content, htmlContent, upvotes, downvotes, userVote, author{name, handle, id}, createdAt}
       }`
-      }
+      };
 
-      return body
+      return body;
   }
 
   public renderAllPosts(pResponse: any): Array<Post> {
-    let posts = new Array<Post>()
-    //let options = {year: 'numeric', month: 'short', day: 'numeric', hour: '' }
-    for(let post of pResponse.data.getPosts) {
-      let id: number = post.id
-      let content: string = post.content
-      let htmlContent: string = post.htmlContent
-      let upvotes: number = post.upvotes
-      let downvotes: number = post.downvotes
-      let userVote: string = post.userVote
-      let author = new Author(post.author.id, post.author.name, post.author.handle)
-      let temp = new Date(Number(post.createdAt))
-      let date = temp.toLocaleString("en-GB")
-
-      posts.push(new Post(id, content, htmlContent, upvotes, downvotes, userVote, date, author))
+    const posts = new Array<Post>();
+    // let options = {year: 'numeric', month: 'short', day: 'numeric', hour: '' }
+    for (const post of pResponse.data.getPosts) {
+      const id: number = post.id;
+      const content: string = post.content;
+      const htmlContent: string = post.htmlContent;
+      const upvotes: number = post.upvotes;
+      const downvotes: number = post.downvotes;
+      const userVote: string = post.userVote;
+      const author = new Author(post.author.id, post.author.name, post.author.handle);
+      const temp = new Date(Number(post.createdAt));
+      const date = temp.toLocaleString('en-GB');
+
+      posts.push(new Post(id, content, htmlContent, upvotes, downvotes, userVote, date, author));
     }
-    return posts
+    return posts;
   }
 }
diff --git a/src/app/services/login/login.service.ts b/src/app/services/login/login.service.ts
index a18d0f4..195b56b 100644
--- a/src/app/services/login/login.service.ts
+++ b/src/app/services/login/login.service.ts
@@ -1,66 +1,83 @@
-import { Injectable, EventEmitter, Output } from '@angular/core';
-import {Http, URLSearchParams, Headers} from '@angular/http';
-import { Login } from '../../models/login';
-import { User } from 'src/app/models/user';
-import { DatasharingService } from '../datasharing.service';
-import { userInfo } from 'os';
+import {Injectable} from '@angular/core';
+import {Headers, Http} from '@angular/http';
+import {Login} from '../../models/login';
+import {User} from 'src/app/models/user';
+import {DatasharingService} from '../datasharing.service';
 import {Router} from '@angular/router';
-import { environment } from 'src/environments/environment';
+import {environment} from 'src/environments/environment';
 
 @Injectable({
   providedIn: 'root'
 })
 export class LoginService {
 
-  constructor(private http: Http, private data: DatasharingService,private router: Router) { }
+  constructor(private http: Http, private data: DatasharingService, private router: Router) {
+  }
+
+  public login(login: Login, errorCb: any) {
 
-  public login(login : Login, errorCb: any) {
- 
-    //let url = './graphql'
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers();
+    const headers = new Headers();
     headers.set('Content-Type', 'application/json');
- 
-    return this.http.post(url, this.buildJson(login))
+
+    return this.http.post(environment.graphQLUrl, this.buildJson(login))
       .subscribe(response => {
-        console.log(response.text());
-        this.loginSuccess();
-        this.updateUserInfo(response.json())
-      }, errorCb
+          console.log(response.text());
+          this.loginSuccess();
+          this.updateUserInfo(response.json());
+        }, errorCb
       );
   }
-  public loginSuccess(){
+
+  public loginSuccess() {
     console.log('alles supi dupi');
-    //do routing
-    this.router.navigateByUrl(''); 
+    this.router.navigateByUrl('');
   }
 
-  public updateUserInfo(response : any){
-    const user: User = new User();
-    user.loggedIn = true;
-    user.userID = response.data.login.id;
-    user.username = response.data.login.name;
-    user.handle = response.data.login.handle;
-    user.email = response.data.login.email;
-    user.points = response.data.login.points;
-    user.level = response.data.login.level;
-    user.friendIDs = response.data.login.friends;
-    user.groupIDs = response.data.login.groups;
-    user.chatIDs = response.data.login.chats;
-    user.requestIDs = response.data.login.requests;
+  public updateUserInfo(response: any) {
+    const loginData = response.data.login;
+    const user: User = new User(
+      loginData.login.id,
+      true,
+      loginData.name,
+      loginData.handle,
+      loginData.email,
+      loginData.points,
+      loginData.level,
+      loginData.friends,
+      loginData.groups,
+      loginData.chats,
+      loginData.requests,
+    );
 
-    this.data.changeUserInfo(user)
-    
+    this.data.changeUserInfo(user);
   }
 
   public buildJson(login: Login): any {
-    const body =  {query: `mutation($email: String, $pwHash: String) {
-      login(email: $email, passwordHash: $pwHash) {id, name,email, handle, points, level, friends{id}, groups{id},chats{id}} 
-    }`, variables: {
+    const body = {
+      query: `mutation($email: String, $pwHash: String) {
+        login(email: $email, passwordHash: $pwHash) {
+          id,
+          name,
+          email,
+          handle,
+          points,
+          level,
+          friends {
+           id
+          },
+          groups {
+            id
+          },
+          chats{
+            id
+          }
+        }
+      }`
+      , variables: {
         email: login.email,
         pwHash: login.passwordHash,
-      }};
+      }
+    };
     return body;
   }
-}//add ,receivedRequests{id} later
+}
diff --git a/src/app/services/register/register.service.ts b/src/app/services/register/register.service.ts
index b05a5aa..1f04c25 100644
--- a/src/app/services/register/register.service.ts
+++ b/src/app/services/register/register.service.ts
@@ -11,32 +11,32 @@ import { environment } from 'src/environments/environment';
 })
 export class RegisterService {
 
-  constructor(private http: Http, private data: DatasharingService,private router: Router) { }
+  constructor(private http: Http, private data: DatasharingService, private router: Router) { }
 
   public register(registration: Registration, errorCb: any) {
- 
-    //let url = './graphql'
-    let url = environment.graphQLUrl
- 
-    let headers = new Headers();
+
+    // let url = './graphql'
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
     headers.set('Content-Type', 'application/json');
- 
+
     return this.http.post(url, this.buildJson(registration))
       .subscribe(response => {
         console.log(response.text());
         this.registerSuccess();
-        this.updateUserInfo(response.json())
+        this.updateUserInfo(response.json());
       }, errorCb
       );
   }
 
-  public registerSuccess(){
+  public registerSuccess() {
     console.log('alles supi dupi');
-    //do routing
+    // do routing
     this.router.navigateByUrl('');
   }
 
-  public updateUserInfo(response : any){
+  public updateUserInfo(response: any) {
     const user: User = new User();
     user.loggedIn = true;
     user.userID = response.data.register.id;
@@ -50,13 +50,13 @@ export class RegisterService {
     user.chatIDs = response.data.register.chats;
     user.requestIDs = response.data.register.requests;
 
-    this.data.changeUserInfo(user)
-    
+    this.data.changeUserInfo(user);
+
   }
 
   public buildJson(registration: Registration): any {
     const body =  {query: `mutation($username: String, $email: String, $pwHash: String) {
-      register(username: $username, email: $email, passwordHash: $pwHash) {id, name, handle, points, level, friends{id}, groups{id},chats{id}} 
+      register(username: $username, email: $email, passwordHash: $pwHash) {id, name, handle, points, level, friends{id}, groups{id},chats{id}}
     }`, variables: {
         email: registration.email,
         pwHash: registration.passwordHash,
diff --git a/src/app/services/selfservice/self.service.ts b/src/app/services/selfservice/self.service.ts
index 5e92abf..03e4caa 100644
--- a/src/app/services/selfservice/self.service.ts
+++ b/src/app/services/selfservice/self.service.ts
@@ -12,36 +12,36 @@ import { environment } from 'src/environments/environment';
 })
 export class SelfService {
 
-  constructor(private http: Http, private data: DatasharingService,private router: Router) { }
+  constructor(private http: Http, private data: DatasharingService, private router: Router) { }
 
   public checkIfLoggedIn() {
     console.log('check if logged in...');
 
-    let url = environment.graphQLUrl;
- 
-    let headers = new Headers();
+    const url = environment.graphQLUrl;
+
+    const headers = new Headers();
     headers.set('Content-Type', 'application/json');
- 
+
     return this.http.post(url, this.buildJson())
       .subscribe(response => {
         console.log(response.text());
         this.stillLoggedIn();
-        this.updateUserInfo(response.json())
+        this.updateUserInfo(response.json());
       }, error => {
-        this.notLoggedIn()
-        console.log(error.text())
+        this.notLoggedIn();
+        console.log(error.text());
       }
       );
   }
-  public stillLoggedIn(){
+  public stillLoggedIn() {
     console.log('user was logged in');
   }
 
-  public notLoggedIn(){
+  public notLoggedIn() {
     console.log('user was not logged in');
   }
 
-  public updateUserInfo(response : any){
+  public updateUserInfo(response: any) {
     const user: User = new User();
     user.loggedIn = true;
     user.userID = response.data.getSelf.id;
@@ -55,14 +55,14 @@ export class SelfService {
     user.chatIDs = response.data.getSelf.chats;
     user.requestIDs = response.data.getSelf.requests;
 
-    this.data.changeUserInfo(user)
+    this.data.changeUserInfo(user);
   }
 
   public buildJson(): any {
     const body =  {query: `{
-      getSelf{id, name,email, handle, points, level, friends{id}, groups{id},chats{id}} 
+      getSelf{id, name,email, handle, points, level, friends{id}, groups{id},chats{id}}
     }`, variables: {
       }};
     return body;
   }
-}//add ,receivedRequests{id} later
+}// add ,receivedRequests{id} later
diff --git a/src/tslint.json b/src/tslint.json
index 52e2c1a..25509b1 100644
--- a/src/tslint.json
+++ b/src/tslint.json
@@ -12,6 +12,9 @@
             "element",
             "app",
             "kebab-case"
-        ]
+        ],
+        "indent": {
+          "options": "spaces"
+        }
     }
 }
diff --git a/tslint.json b/tslint.json
index 6ddb6b2..a3a101d 100644
--- a/tslint.json
+++ b/tslint.json
@@ -4,6 +4,7 @@
   ],
   "rules": {
     "arrow-return-shorthand": true,
+    "brace-style": "1tbs",
     "callable-types": true,
     "class-name": true,
     "comment-format": [
@@ -11,6 +12,7 @@
       "check-space"
     ],
     "curly": true,
+    "cyclomatic-complexity": true,
     "deprecation": {
       "severity": "warn"
     },
@@ -23,13 +25,15 @@
     "import-spacing": true,
     "indent": [
       true,
-      "spaces"
+      "spaces",
+      4
     ],
     "interface-over-type-literal": true,
     "label-position": true,
+    "max-classes-per-file": true,
     "max-line-length": [
       true,
-      140
+      120
     ],
     "member-access": false,
     "member-ordering": [
@@ -43,6 +47,7 @@
         ]
       }
     ],
+    "new-parens": true,
     "no-arg": true,
     "no-bitwise": true,
     "no-console": [
@@ -74,6 +79,7 @@
     "no-unnecessary-initializer": true,
     "no-unused-expression": true,
     "no-use-before-declare": true,
+    "no-var-requires": true,
     "no-var-keyword": true,
     "object-literal-sort-keys": false,
     "one-line": [
@@ -89,10 +95,7 @@
       "single"
     ],
     "radix": true,
-    "semicolon": [
-      true,
-      "always"
-    ],
+    "semicolon": true,
     "triple-equals": [
       true,
       "allow-null-check"
@@ -121,6 +124,7 @@
     "use-input-property-decorator": true,
     "use-output-property-decorator": true,
     "use-host-property-decorator": true,
+    "no-internal-module": true,
     "no-input-rename": true,
     "no-output-rename": true,
     "use-life-cycle-interface": true,