NativeScript/apps/app/ui-tests-app/search-bar/issue-5039-view-model.ts

import { Observable } from 'tns-core-modules/data/observable'
import { ObservableArray } from 'tns-core-modules/data/observable-array'
import { SearchBar } from 'tns-core-modules/ui/search-bar';

export class Issue5039ViewModel extends Observable {

    private _items = ['apple', 'apple cider', 'apple pie', 'orange', 'orange juice', 'strawberry', 'blueberry']
    public items = new ObservableArray()

    constructor(private _searchBar: SearchBar) {
        super()
        this.items.push(this._items)
    }

    onSubmit() {
        this.filter(this._searchBar.text);
    }

    clearSearch() {
        this.filter();
    }
    
    filter(value: string = '') {
        this.items.splice(0, this.items.length) // remove all items
        this.items.push(this._items.filter(i => -1 !== i.indexOf(value)))
    }
}