Constructing a to-do list application utilizing Angular 2.0 and above can facilitate the acquisition of best practices for single-page applications (SPAs). This is because such an endeavor necessitates the mastery of techniques for controlling application state, managing user interactions, and developing responsive interfaces. By prioritizing the adoption of best practices, one can gain insights into not only the fundamental elements of SPA applications, but also how to ensure their security, reliability, and proper functioning.

• setting up the environment

• our first angular app

• enforcing code style

• unit testing

• git + github workflows

  1.setting up the environment

  software prequisites:

  • vs code,
  • git,
  • node/npm 8.5 or later
  • Angular CLI 14.2 or later

verifiy node, git, npm:

john@$ %: node -v
v18.7.0
john@$ %: npm -v
8.18.0
john@$ %: git --version
git version 2.32.1 (Apple Git-133)

important note: node is an extremely popular js runtime that is used create backend applications of all sizes, with its package manager node hosts one of the richest ecosystems for developers to jump-in and begin coding.

This project is developed in Visual Studio Code. For the best development experience, install the following extensions:

• Azure Tools by Microsoft
• Angular Language Service by Angular
• ESLint by Microsoft
• Stylelint by Stylelint
• Prettier by Prettier
• npm by Microsoft
• YAML by Red Hat

👉 It's highly recommended to enable "Format on Save" in Visual Studio Code. This will automatically format your source code using the provided Prettier settings and ensures a consistent style throughout the codebase.

The project structure and basic concepts follow the Medium article How to architect epic Angular app in less than 10 minutes!.

To get more help on the Angular CLI use ng help or go check out the Angular CLI Overview and Command Reference page.

2.initialize our first angular app

mkdir todo-angular && cd todo-angular
npm install -g @angular/cli

Angular CLI commands all start with ng, followed by what you'd like the CLI to do. In the Desktop directory, use the following ng new command to create a new application called todo:

ng new todo --routing=false --style=scss

Navigate into your new project with the following cd command:

cd todo

To run your todo application, use ng serve:

ng serve

3.enforcing code style

TBD

4.unit testing

Let's examine the main reasons why utilizing unit testing is beneficial for your solution:

• Enhance implementation design: One of the common pitfalls developers encounter is coding without much thought for design. However, using unit testing forces you to consider and reconsider the design, particularly when using Test-Driven Development (TDD), which has an even greater impact.

• Facilitate refactoring: With pre-existing tests that guarantee the expected functionality, you can confidently make modifications to the code without introducing any bugs.

• Prevent breaking functionality while adding new features: Tests can be run to ensure that any newly added features do not disrupt existing application components.

While there are numerous other benefits, these three alone can provide a significant advantage to any project, making them crucial factors to consider. If you are still unconvinced, a few more advantages are worth mentioning.

Karma

Angular uses Karma as the built in testing engine. A typical test will look something like this...

import { TestBed } from '@angular/core/testing';
import { AppComponent } from './app.component';

describe('AppComponent', () => {
  beforeEach(async () => {
    await TestBed.configureTestingModule({
      declarations: [AppComponent],
    }).compileComponents();
  });

  it('should create the app', () => {
    const fixture = TestBed.createComponent(AppComponent);
    const app = fixture.componentInstance;
    expect(app).toBeTruthy();
  });
});