private getPersons() : ObservableArray<Person> {        
        var data = new ObservableArray<Person>();

        for (var i = 0; i < 30; i++) {
            if(i % 2 == 0)
            {
                 data.push(new Person(i, "John Doe ", false));
            }      
            else
            {
                data.push(new Person(i, "Jessica Donovan", true));
            }      
        }
        
        return data; 
    }

    private initDataItems() {
        this._items = new ObservableArray<DataItem>();

        for (var i = 0; i < 25; i++) {
            this._items.push(new DataItem(i, "Item " + i, "This is item description."));
        }
    }

    private initDataItems() {
        if (!this._dataItems) {
            this._dataItems = new ObservableArray<DataItem>();

            for (var i = 1; i <= 50; i++) {
                this._dataItems.push(new DataItem(i, "http://lorempixel.com/400/200/"));
            }
        }
    }

    public clear() {
        this._notifications.length = 0;
        this._notifications.notify({
            eventName: ObservableArray.changeEvent,
            object: this._notifications
        });

        this.serialize();
    }

 public onSubmit(value) {
     this.myItems = new ObservableArray<DataItem>();
     let searchValue = value.toLowerCase();
     if (value !== "") {
         for (let i = 0; i < this.arrayItems.length; i++) {
             if (this.arrayItems[i].name.toLowerCase().indexOf(searchValue) !== -1) {
                 this.myItems.push(this.arrayItems[i]);
             }
         }
     }
 }

 return new Promise<ObservableArray<Session>>((resolve, reject) => {
     let sessions = new ObservableArray<Session>([]);
 
     try {
 
         FileReader.readJSON('data/sessions.json').then((content: Array<Object>) => {
             content.forEach((item: any) => {
                 let speaker = SpeakerService.GetSpeaker(item.speakerId).then((speaker) => { 
                     sessions.push(new Session(item.sessionName, item.sessionDesc, item.location, speaker));
                 }); 
             });
             
             resolve(sessions);
         });
     }
     catch (err) {
         reject(err);
     }   
 });

import { ObservableArray } from "data/observable-array";
import { CoinViewModel } from "./coin-view-model";

export var allCoinsViewModel = new ObservableArray();

allCoinsViewModel.push(new CoinViewModel("2 Stotinki", "1881", 2.0, 18, "Copper", "https://www.sixbid.com/images/auction_images/1186/1096532m.jpg", 1500000));
allCoinsViewModel.push(new CoinViewModel("5 Stotinki", "1881", 5.0, 23, "Copper", null, 5000000));
allCoinsViewModel.push(new CoinViewModel("10 Stotinki", "1881", 10.0, 27, "Copper", "http://coinquest.com/cgi-data/cq_ro/response_380/bulgaria_10_stotinki_1881.jpg", 10000000));
allCoinsViewModel.push(new CoinViewModel("2 Leva", "1882", 10.0, 24, "Silver", "http://www.coinfactswiki.com/w/images/thumb/c/ce/Bulgaria_H3035-30177r.jpg/300px-Bulgaria_H3035-30177r.jpg", 2500000));
allCoinsViewModel.push(new CoinViewModel("50 Sotinki", "1883", 2.5, 18, "Silver", null, 2400000));

allCoinsViewModel.push(new CoinViewModel("5 Leva", "1884", 25.00, 37, "Silver", null, 1500000));
allCoinsViewModel.push(new CoinViewModel("5 Leva", "1885", 25.00, 37, "Silver", "https://www.numisbids.com/sales/hosted/album/018/thumb02228.jpg", 1500000));
allCoinsViewModel.push(new CoinViewModel("10 Leva", "1894", 10.0, 27, "Gold", "http://agroplovdiv.bg/wp-content/uploads/2014/04/084143N2.jpg", 10000000));
allCoinsViewModel.push(new CoinViewModel("100 Leva", "1894", 10.0, 24, "Gold", "http://www.tableti.biz/uploads/com_article/gallery/0f2057e670c3cae8231b7d6316753fb9465652ab.jpg", 2500000));
allCoinsViewModel.push(new CoinViewModel("2-1/2 Sotinki", "1888", 2.5, 18, "Copper", null, 2400000));

 public onUpdateItemClick(args: listViewModule.ListViewEventData) {
     for (var index = 0; index < this._items.length; index++) {
           this._items.getItem(index).id = Math.random() * 100;
         this._items.getItem(index).itemName = "This is an updated item";
         this._items.getItem(index).itemDescription = "This is the updated item's description.";
     }
 }

    this.responseStream = this.bluetoothService.requestStream.subscribe(response => {
      if (response) {
        const data = new Int16Array(response.value);
        const reading: IAccelerometer = {
          X: data[5] / (32768 / 16),
          Y: data[4] / (32768 / 16),
          Z: data[3] / (32768 / 16),
          Time: ++this.counter,
        };
        this.source.unshift(reading);

        if (this.source.length > 25) {
          this.source.pop();
        }
      }
    });

export function loaded (args:EventData){
    view = args.object;
    view.bindingContext = vm;
    observableTweets.push(fetchData().map(function(item){
        return new Observable(item);
    }));
};   

    this.database.addDatabaseChangeListener((changes) => {
      var changeIndex;
      for (var i = 0; i < changes.length; i++) {
        var documentId;

        documentId = changes[i].getDocumentId();
        changeIndex = this.indexOfObjectId(documentId, this.personList);
        var document = this.database.getDocument(documentId);

        if (changeIndex == -1) {
          this.personList.push(document);
        } else {
          this.personList.setItem(changeIndex, document);
        }
      }
    });

    private serialize() {
        var items = [];
        this._notifications.forEach((item: any) => {
            items.push(item);
        });

        applicationSettingsModule.setString(NOTIFICATION_MESSAGES, JSON.stringify(items));
    }

 private refresh() {
   var rows = this.database.executeQuery("people");
   for (var i in rows) {
     if (rows.hasOwnProperty(i)) {
       this.personList.push(JSON.parse(rows[i]));
     }
   }
 }

        service.on(NotificationMessageEvent, (args: NotificationEventData) => {
            this._notifications.unshift({
                Message: args.message,
                Date: new Date()
            });

            this.serialize();
        });

 return new Promise<{}> ((resolve, reject) => {
     
     houseRank.calculateRank().then(rank => {
         this.houseRank.splice(0);
         this.houseRank.push(rank);
         
         resolve();
     }, reject);
 })

	private preparePictures() {
		this._todoItems.push(new ListItem("Call Brian Ingram regarding the hotel reservations", false, false));
		this._todoItems.push(new ListItem("See weather forecast for London", true, false));
		this._todoItems.push(new ListItem("Prepare the children's documents", false, false));
		this._todoItems.push(new ListItem("Check the Paris - London trains schedule", true, false));
		this._todoItems.push(new ListItem("Ask Jonah if he will take care of the dog", false, false));
		this._todoItems.push(new ListItem("Reschedule airplane tickets for the next month's flight to Hawaii", false, false));
		this._todoItems.push(new ListItem("Bills due: Alissa's ballet class fee", false, false));

		this._shoppingList.push(new ListItem("Milk", false, false));
		this._shoppingList.push(new ListItem("Salmon", true, false));
		this._shoppingList.push(new ListItem("Eggs", false, false));
		this._shoppingList.push(new ListItem("Almonds", true, false));
		this._shoppingList.push(new ListItem("Chicken", false, false));
		this._shoppingList.push(new ListItem("Beef", false, false));
		this._shoppingList.push(new ListItem("Yogurt", false, false));
		this._shoppingList.push(new ListItem("Spinach", false, false));
		this._shoppingList.push(new ListItem("Carrots", true, false));
		this._shoppingList.push(new ListItem("Apples", false, false));
		this._shoppingList.push(new ListItem("Tomatoes", true, false));
	}

 this.arrayItems.forEach(item => {
     this.myItems.push(item);
 });

 public onUserTap(userItem: ItemEventData): void {
   let user = this.users.getItem(userItem.index);
   this.sessionService.setCurrentUser(user);
   this.router.navigate(["bluetooth"]);
 }

 public onRemoveItemClick(args: ListViewEventData) {
     this._dataItems.splice(this._dataItems.length - 1, 1);
 }

 private refresh() {
   var rows = this.database.executeQuery("people");
   for(var i = 0; i < rows.length; i++) {
       this.personList.push(rows[i]);
   }
 }