app.component.ts

// app.component.ts

import { Component, OnInit } from '@angular/core';
import * as shuffle from 'lodash/fp/shuffle';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
  cards: PolyTest.Card[];
  totalSeconds = 0;
  timer: any = 0;
  currentTime: PolyTest.Time = { hour: 0, minute: 0, second: 0 };
  isGameCompleted = false;

  ngOnInit() {
    this.cards = this.shuffleCards();
  }

  private shuffleCards(): PolyTest.Card[] {
    // ...
  }

  resetGame() {
    // ...
  }

  startGame() {
    // ...
  }

  stopGame() {
    // ...
  }

  // update the time every second
  updateTime() {
    // ...
  }
}