constructor(routeParams:RouteParams, private pictureservice:PictureService) {
   this.id = routeParams.get('id');
 }

 constructor(private _service:BooksService,
             private _router:Router,
             routeParams:RouteParams) {
     this._selectedId = +routeParams.get('id');
 }

 constructor(
   private _questionnaireService:QuestionnaireService,
   routeParams:RouteParams) {
   this._id = routeParams.get('id');
 }

 ngOnInit() {
   // Notice how we extract the id by calling the RouteParams.get method.
   let id = +this._routeParams.get('id'); // The hero id is a number. Route parameters are always strings. So we convert the route parameter value to a number with the JavaScript (+) operator.
   this._heroService.getHero(id)
     .then(hero => this.hero = hero);
 }

 constructor(params: RouteParams, phones: Phones) {
     phones.getPhone({ phoneId: params.get("phoneId") }).then((phone) => {
         this.phone = phone;
         this.mainImageUrl = phone.images[0];
     });
 }

 ngOnInit():any {
     let itemIndex = this._routerParams.get('recipeIndex');
     this._recipeIndex = itemIndex;
     this.recipe = this._recipeService.getRecipe(+itemIndex) || null;
 }

 _dataService.events$.map(events => events.find(event => event.id === _params.get('id')));

 ngOnInit() {
   // convert the route parameter value to a number with the JavaScript (+) operator.
   let id = +this._routeParams.get('id');
   this._heroService.getHero(id)
     .then(hero => this.hero = hero);
 }

 ngOnInit() {
     let id = +this.routeParams.get('id');
     this.postService.getPost(id)
         .subscribe(post => this.post = post);
 }

 ngOnInit():any {
     this.newSoldier = {name: this._routeParams.get('name'), power: null, health: null};
 }