Angular environment construction and simple experience summary

npm install -g typescript
npm install -g @angular/cli

ng new angular2-hello-world

cd angular2-hello-world
sudo apt install tree
tree -F -L 1

.
├── angular.json
├── karma.conf.js
├── node_modules/
├── package.json
├── package-lock.json
├── README.md
├── src/
├── tsconfig.app.json
├── tsconfig.json
└── tsconfig.spec.json

2 directories, 8 files

cd src
tree -F

ng serve

ng-generate component hello-world

//Import dependenciesimport { Component, OnInit } from '@angular/core';

//Declare the control's selector and related file URLs through annotations
@Component({
  selector: 'app-hello-world',
  templateUrl: './hello-world.component.html',
  styleUrls: ['./hello-world.component.css']
})

//Component data model export class HelloWorldComponent implements OnInit {

  constructor() { }

  ngOnInit(): void {
  }

}

<p>mango, hello-world works!</p>

<h1>
  <app-hello-world></app-hello-world>
</h1>

mango@mango:~/angular2-hello-world$ ng generate component user-item
CREATE src/app/user-item/user-item.component.css (0 bytes)
CREATE src/app/user-item/user-item.component.html (24 bytes)
CREATE src/app/user-item/user-item.component.spec.ts (641 bytes)
CREATE src/app/user-item/user-item.component.ts (286 bytes)
UPDATE src/app/app.module.ts (585 bytes)

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-user-item',
  templateUrl: './user-item.component.html',
  styleUrls: ['./user-item.component.css']
})
export class UserItemComponent implements OnInit {
  name: string,

  constructor() { 
    this.name = 'mango';
  }

  ngOnInit(): void {
  }

}

<p>
    {{name}} welcome into Angular world.
</p>

mango@mango:~/angular2-hello-world$ ng generate component user-list
CREATE src/app/user-list/user-list.component.css (0 bytes)
CREATE src/app/user-list/user-list.component.html (24 bytes)
CREATE src/app/user-list/user-list.component.spec.ts (641 bytes)
CREATE src/app/user-list/user-list.component.ts (286 bytes)
UPDATE src/app/app.module.ts (677 bytes)

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-user-list',
  templateUrl: './user-list.component.html',
  styleUrls: ['./user-list.component.css']
})
export class UserListComponent implements OnInit {
  names: string[];
  constructor() { 
    this.names = ['mango', 'pear', 'grap', 'apple'];
  }

  ngOnInit(): void {
  }

}

<ul>
    <li *ngFor="let name of names">Hello {{name}}</li>
</ul>

import { Component, OnInit, Input } from '@angular/core';

@Component({
  selector: 'app-user-item',
  templateUrl: './user-item.component.html',
  styleUrls: ['./user-item.component.css']
})
export class UserItemComponent implements OnInit {
  @Input()
  name!: string;

  constructor() { 
    
  }

  ngOnInit(): void {
  }

}

<ul>
    <app-user-item *ngFor="let name of names" [name]="name"></app-user-item>
</ul>

{
            "outputPath": "dist/angular2-hello-world",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.app.json",
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "src/styles.css"
            ],
            "scripts": []
          }

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';
import { environment } from './environments/environment';

if (environment.production) {
  enableProdMode();
}

platformBrowserDynamic().bootstrapModule(AppModule)
  .catch(err => console.error(err));

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

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { HelloWorldComponent } from './hello-world/hello-world.component';
import { UserItemComponent } from './user-item/user-item.component';
import { UserListComponent } from './user-list/user-list.component';

@NgModule({
  declarations: [
    AppComponent,
    HelloWorldComponent,
    UserItemComponent,
    UserListComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }