dev-mauricioAB

// Iterator interface
interface Iterator<T> {
  next(): T | null;
  hasNext(): boolean;
}

// Aggregate interface
interface IterableCollection<T> {
  createIterator(): Iterator<T>;
}

dev-mauricioAB

// Component interface
interface Coffee {
  cost(): number;
  description(): string;
}

// Concrete component
class SimpleCoffee implements Coffee {
  cost(): number {
    return 5;

dev-mauricioAB

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { AppRoutingModule } from './app-routing.module';

import { AppComponent } from './app.component';
import { FirstComponent } from './components/first/first.component';
import { SecondComponent } from './components/second/second.component';

@NgModule({