Angular Renaissance vs Angular Comparison

Reactivity

Declare state

Angular Renaissance

import { Component, signal } from "@angular/core";

@Component({
  selector: "app-name",
  template: `<h1>Hello {{ name() }}</h1>`,
})
export class NameComponent {
  name = signal("John");
}

Angular

import { Component, NgModule } from "@angular/core";

@Component({
  selector: "app-name",
  template: `<h1>Hello {{ name }}</h1>`,
})
export class NameComponent {
  name = "John";
}

@NgModule({
  declarations: [NameComponent],
  exports: [NameComponent],
})
export class NameModule {}

Update state

Angular Renaissance

import { Component, signal } from "@angular/core";

@Component({
  selector: "app-name",
  template: `<h1>Hello {{ name() }}</h1>`,
})
export class NameComponent {
  name = signal("John");

  constructor() {
    this.name.set("Jane");
  }
}

Angular

import { Component, NgModule } from "@angular/core";

@Component({
  selector: "app-name",
  template: `<h1>Hello {{ name }}</h1>`,
})
export class NameComponent {
  name = "John";

  constructor() {
    this.name = "Jane";
  }
}

@NgModule({
  declarations: [NameComponent],
  exports: [NameComponent],
})
export class NameModule {}

Computed state

Angular Renaissance

import { Component, computed, signal } from "@angular/core";

@Component({
  selector: "app-double-count",
  template: `<div>{{ doubleCount() }}</div>`,
})
export class DoubleCountComponent {
  count = signal(10);

  doubleCount = computed(() => this.count() * 2);
}

Angular

import { Component, NgModule } from "@angular/core";

@Component({
  selector: "app-doublecount",
  template: `<div>{{ doubleCount }}</div>`,
})
export class DoublecountComponent {
  count = 10;

  get doubleCount() {
    return this.count * 2;
  }
}

@NgModule({
  declarations: [DoublecountComponent],
  exports: [DoublecountComponent],
})
export class DoublecountModule {}

Templating

Minimal template

Angular Renaissance

import { Component } from "@angular/core";

@Component({
  selector: "app-hello-world",
  template: `<h1>Hello world</h1>`,
})
export class HelloWorldComponent {}

Angular

import { Component, NgModule } from "@angular/core";

@Component({
  selector: "app-helloworld",
  template: `<h1>Hello world</h1>`,
})
export class HelloworldComponent {}

@NgModule({
  declarations: [HelloworldComponent],
  exports: [HelloworldComponent],
})
export class HelloworldModule {}

Styling

Angular Renaissance

import { Component } from "@angular/core";

@Component({
  selector: "app-css-style",
  template: `
    <h1 class="title">I am red</h1>
    <button style="font-size: 10rem">I am a button</button>
  `,
  styles: `
    .title {
      color: red;
    }
  `,
})
export class CssStyleComponent {}

Angular

import { Component, NgModule } from "@angular/core";

@Component({
  selector: "app-cssstyle",
  template: `
    <h1 class="title">I am red</h1>
    <button style="font-size: 10rem">I am a button</button>
  `,
  styles: [
    `
      .title {
        color: red;
      }
    `,
  ],
})
export class CssStyleComponent {}

@NgModule({
  declarations: [CssStyleComponent],
  exports: [CssStyleComponent],
})
export class CssStyleModule {}

Loop

Angular Renaissance

import { Component } from "@angular/core";

@Component({
  selector: "app-colors",
  template: `
    <ul>
      @for (color of colors; track color) {
      <li>{{ color }}</li>
      }
    </ul>
  `,
})
export class ColorsComponent {
  colors = ["red", "green", "blue"];
}

Angular

import { Component, NgModule } from "@angular/core";
import { CommonModule } from "@angular/common";

@Component({
  selector: "app-colors",
  template: `
    <ul>
      <li *ngFor="let color of colors">{{ color }}</li>
    </ul>
  `,
})
export class ColorsComponent {
  colors = ["red", "green", "blue"];
}

@NgModule({
  declarations: [ColorsComponent],
  imports: [CommonModule],
  exports: [ColorsComponent],
})
export class ColorsModule {}

Event click

Angular Renaissance

import { Component, signal } from "@angular/core";

@Component({
  selector: "app-counter",
  template: `
    <p>Counter: {{ count() }}</p>
    <button (click)="incrementCount()">+1</button>
  `,
})
export class CounterComponent {
  count = signal(0);

  incrementCount() {
    this.count.update((count) => count + 1);
  }
}

Angular

import { Component, NgModule } from "@angular/core";

@Component({
  selector: "app-counter",
  template: `
    <p>Counter: {{ count }}</p>
    <button (click)="incrementCount()">+1</button>
  `,
})
export class CounterComponent {
  count = 0;

  incrementCount() {
    this.count++;
  }
}

@NgModule({
  declarations: [CounterComponent],
  exports: [CounterComponent],
})
export class CounterModule {}

DOM ref

Angular Renaissance

import {
  afterNextRender,
  Component,
  ElementRef,
  viewChild,
} from "@angular/core";

@Component({
  selector: "app-input-focused",
  template: `<input type="text" #inputRef />`,
})
export class InputFocusedComponent {
  inputRef = viewChild.required<ElementRef<HTMLInputElement>>("inputRef");

  constructor() {
    afterNextRender({ write: () => this.inputRef().nativeElement.focus() });
  }
}

Angular

import {
  Component,
  ViewChild,
  ElementRef,
  OnInit,
  NgModule,
} from "@angular/core";

@Component({
  selector: "app-inputfocused",
  template: `<input type="text" #inputRef />`,
})
export class InputfocusedComponent implements OnInit {
  @ViewChild("inputRef", { static: true })
  inputRef!: ElementRef<HTMLInputElement>;

  ngOnInit() {
    this.inputRef.nativeElement.focus();
  }
}

@NgModule({
  declarations: [InputfocusedComponent],
  exports: [InputfocusedComponent],
})
export class InputfocusedModule {}

Conditional

Angular Renaissance

import { Component, computed, signal } from "@angular/core";

const TRAFFIC_LIGHTS = ["red", "orange", "green"];

@Component({
  selector: "app-traffic-light",
  template: `
    <button (click)="nextLight()">Next light</button>
    <p>Light is: {{ light() }}</p>
    <p>
      You must @switch (light()) { @case ("red") {
      <span>STOP</span>
      } @case ("orange") {
      <span>SLOW DOWN</span>
      } @case ("green") {
      <span>GO</span>
      } }
    </p>
  `,
})
export class TrafficLightComponent {
  lightIndex = signal(0);

  light = computed(() => TRAFFIC_LIGHTS[this.lightIndex()]);

  nextLight() {
    this.lightIndex.update((index) => (index + 1) % TRAFFIC_LIGHTS.length);
  }
}

Angular

import { Component, NgModule } from "@angular/core";
import { CommonModule } from "@angular/common";

const TRAFFIC_LIGHTS = ["red", "orange", "green"];

@Component({
  selector: "app-trafficlight",
  template: `
    <button (click)="nextLight()">Next light</button>
    <p>Light is: {{ light }}</p>
    <p>
      You must
      <ng-container [ngSwitch]="light">
        <span *ngSwitchCase="'red'">STOP</span>
        <span *ngSwitchCase="'orange'">SLOW DOWN</span>
        <span *ngSwitchCase="'green'">GO</span>
      </ng-container>
    </p>
  `,
})
export class TrafficlightComponent {
  lightIndex = 0;

  get light() {
    return TRAFFIC_LIGHTS[this.lightIndex];
  }

  nextLight() {
    this.lightIndex = (this.lightIndex + 1) % TRAFFIC_LIGHTS.length;
  }
}

@NgModule({
  declarations: [TrafficlightComponent],
  imports: [CommonModule],
  exports: [TrafficlightComponent],
})
export class TrafficlightModule {}

Lifecycle

On mount

Angular Renaissance

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

@Component({
  selector: "app-page-title",
  template: `<p>Page title: {{ pageTitle() }}</p>`,
})
export class PageTitleComponent implements OnInit {
  pageTitle = signal("");

  ngOnInit() {
    this.pageTitle.set(document.title);
  }
}

Angular

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

@Component({
  selector: "app-pagetitle",
  template: `<p>Page title: {{ pageTitle }}</p>`,
})
export class PagetitleComponent implements OnInit {
  pageTitle = "";

  ngOnInit() {
    this.pageTitle = document.title;
  }
}

@NgModule({
  declarations: [PagetitleComponent],
  exports: [PagetitleComponent],
})
export class PagetitleModule {}

On unmount

Angular Renaissance

import { Component, OnDestroy, signal } from "@angular/core";

@Component({
  selector: "app-time",
  template: `<p>Current time: {{ time() }}</p>`,
})
export class TimeComponent implements OnDestroy {
  time = signal(new Date().toLocaleTimeString());

  timer = setInterval(
    () => this.time.set(new Date().toLocaleTimeString()),
    1000
  );

  ngOnDestroy() {
    clearInterval(this.timer);
  }
}

Angular

import { Component, NgModule, OnDestroy } from "@angular/core";

@Component({
  selector: "app-time",
  template: `<p>Current time: {{ time }}</p>`,
})
export class TimeComponent implements OnDestroy {
  time = new Date().toLocaleTimeString();

  timer = setInterval(() => {
    this.time = new Date().toLocaleTimeString();
  }, 1000);

  ngOnDestroy() {
    clearInterval(this.timer);
  }
}

@NgModule({
  declarations: [TimeComponent],
  exports: [TimeComponent],
})
export class TimeModule {}

Component composition

Props

Angular Renaissance

import { Component } from "@angular/core";
import { UserprofileComponent } from "./userprofile.component";

@Component({
  selector: "app-root",
  imports: [UserprofileComponent],
  template: `
    <app-userprofile
      name="John"
      [age]="20"
      [favouriteColors]="['green', 'blue', 'red']"
      [isAvailable]="true"
    />
  `,
})
export class AppComponent {}

Angular

import { Component, NgModule } from "@angular/core";
import { UserprofileModule } from "./userprofile.component";

@Component({
  selector: "app-root",
  template: `
    <app-userprofile
      name="John"
      [age]="20"
      [favouriteColors]="['green', 'blue', 'red']"
      [isAvailable]="true"
    >
    </app-userprofile>
  `,
})
export class AppComponent {}

@NgModule({
  declarations: [AppComponent],
  imports: [UserprofileModule],
  bootstrap: [AppComponent],
})
export class AppModule {}

Emit to parent

Angular Renaissance

import { Component, signal } from "@angular/core";
import { AnswerButtonComponent } from "./answer-button.component";

@Component({
  selector: "app-root",
  imports: [AnswerButtonComponent],
  template: `
    <p>Are you happy?</p>

    <app-answer-button (yes)="onAnswerYes()" (no)="onAnswerNo()" />

    <p style="font-size: 50px">{{ isHappy() ? "😀" : "😥" }}</p>
  `,
})
export class AppComponent {
  isHappy = signal(true);

  onAnswerYes() {
    this.isHappy.set(true);
  }

  onAnswerNo() {
    this.isHappy.set(false);
  }
}

Angular

import { Component, NgModule } from "@angular/core";
import { AnswerButtonModule } from "./answer-button.component";

@Component({
  selector: "app-root",
  template: `
    <p>Are you happy?</p>

    <app-answer-button (yes)="onAnswerYes()" (no)="onAnswerNo()">
    </app-answer-button>

    <p style="font-size: 50px">{{ isHappy ? "😀" : "😥" }}</p>
  `,
})
export class AppComponent {
  isHappy = true;

  onAnswerYes() {
    this.isHappy = true;
  }

  onAnswerNo() {
    this.isHappy = false;
  }
}

@NgModule({
  declarations: [AppComponent],
  imports: [AnswerButtonModule],
  bootstrap: [AppComponent],
})
export class AppModule {}

Slot

Angular Renaissance

import { Component } from "@angular/core";
import { FunnyButtonComponent } from "./funny-button.component";

@Component({
  selector: "app-root",
  imports: [FunnyButtonComponent],
  template: `<app-funny-button>Click me!</app-funny-button>`,
})
export class AppComponent {}

Angular

import { Component, NgModule } from "@angular/core";
import { FunnyButtonModule } from "./funny-button.component";

@Component({
  selector: "app-root",
  template: `<app-funny-button>Click me!</app-funny-button>`,
})
export class AppComponent {}

@NgModule({
  declarations: [AppComponent],
  imports: [FunnyButtonModule],
  bootstrap: [AppComponent],
})
export class AppModule {}

Slot fallback

Angular Renaissance

import { Component } from "@angular/core";
import { FunnyButtonComponent } from "./funny-button.component";

@Component({
  selector: "app-root",
  imports: [FunnyButtonComponent],
  template: `
    <app-funny-button />

    <app-funny-button>I got content!</app-funny-button>
  `,
})
export class AppComponent {}

Angular

import { Component, NgModule } from "@angular/core";

@Component({
  selector: "app-root",
  template: `
    <app-funny-button></app-funny-button>

    <app-funny-button>
      <ng-template #content>I got content!</ng-template>
    </app-funny-button>
  `,
})
export class AppComponent {}

@NgModule({
  declarations: [AppComponent],
  imports: [FunnyButtonModule],
  bootstrap: [AppComponent],
})
export class AppModule {}

Context

Angular Renaissance

import { Component, inject } from "@angular/core";
import { UserService } from "./user.service";
import { UserProfileComponent } from "./user-profile.component";

@Component({
  imports: [UserProfileComponent],
  providers: [UserService],
  selector: "app-root",
  template: `
    <h1>Welcome back, {{ userService.user().username }}</h1>
    <app-user-profile />
  `,
})
export class AppComponent {
  protected userService = inject(UserService);
}

Angular

import { Component, NgModule } from "@angular/core";
import { UserService } from "./user.service";
import { UserProfileModule } from "./user-profile.component";

@Component({
  providers: [UserService],
  selector: "app-root",
  template: `
    <h1>Welcome back, {{ userService.user.username }}</h1>
    <app-user-profile />
  `,
})
export class AppComponent {
  constructor(public userService: UserService) {}
}

@NgModule({
  declarations: [AppComponent],
  imports: [UserProfileModule],
  bootstrap: [AppComponent],
})
export class AppModule {}

Form input

Input text

Angular Renaissance

import { Component, signal } from "@angular/core";
import { FormsModule } from "@angular/forms";

@Component({
  imports: [FormsModule],
  selector: "app-input-hello",
  template: `
    <p>{{ text() }}</p>
    <input [(ngModel)]="text" />
  `,
})
export class InputHelloComponent {
  text = signal("");
}

Angular

import { Component, NgModule } from "@angular/core";
import { FormsModule } from "@angular/forms";

@Component({
  selector: "app-input-hello",
  template: `
    <p>{{ text }}</p>
    <input [(ngModel)]="text" />
  `,
})
export class InputHelloComponent {
  text = "";
}

@NgModule({
  declarations: [InputHelloComponent],
  imports: [FormsModule],
  exports: [InputHelloComponent],
})
export class InputHelloModule {}

Checkbox

Angular Renaissance

import { Component, signal } from "@angular/core";
import { FormsModule } from "@angular/forms";

@Component({
  imports: [FormsModule],
  selector: "app-is-available",
  template: `
    <input id="is-available" type="checkbox" [(ngModel)]="isAvailable" />
    <label for="is-available">Is available</label>
  `,
})
export class IsAvailableComponent {
  isAvailable = signal(false);
}

Angular

import { Component, NgModule } from "@angular/core";
import { FormsModule } from "@angular/forms";

@Component({
  selector: "app-is-available",
  template: `
    <input id="is-available" type="checkbox" [(ngModel)]="isAvailable" />
    <label for="is-available">Is available</label>
  `,
})
export class IsAvailableComponent {
  isAvailable = false;
}

@NgModule({
  declarations: [IsAvailableComponent],
  imports: [FormsModule],
  exports: [IsAvailableComponent],
})
export class IsAvailableModule {}

Radio

Angular Renaissance

import { Component, signal } from "@angular/core";
import { FormsModule } from "@angular/forms";

@Component({
  imports: [FormsModule],
  selector: "app-pick-pill",
  template: `
    <div>Picked: {{ picked() }}</div>

    <input id="blue-pill" type="radio" value="blue" [(ngModel)]="picked" />
    <label for="blue-pill">Blue pill</label>

    <input id="red-pill" type="radio" value="red" [(ngModel)]="picked" />
    <label for="red-pill">Red pill</label>
  `,
})
export class PickPillComponent {
  picked = signal("red");
}

Angular

import { Component, NgModule } from "@angular/core";
import { FormsModule } from "@angular/forms";

@Component({
  selector: "app-pick-pill",
  template: `
    <div>Picked: {{ picked }}</div>

    <input id="blue-pill" type="radio" value="blue" [(ngModel)]="picked" />
    <label for="blue-pill">Blue pill</label>

    <input id="red-pill" type="radio" value="red" [(ngModel)]="picked" />
    <label for="red-pill">Red pill</label>
  `,
})
export class PickPillComponent {
  picked = "red";
}

@NgModule({
  declarations: [PickPillComponent],
  imports: [FormsModule],
  exports: [PickPillComponent],
})
export class PickPillModule {}

Select

Angular Renaissance

import { Component, signal } from "@angular/core";
import { FormsModule } from "@angular/forms";

@Component({
  imports: [FormsModule],
  selector: "app-color-select",
  template: `
    <select [(ngModel)]="selectedColorId">
      @for (let color of colors; track: color) {
      <option [value]="color.id" [disabled]="color.isDisabled">
        {{ color.text }}
      </option>
      }
    </select>
  `,
})
export class ColorSelectComponent {
  selectedColorId = signal(2);

  colors = [
    { id: 1, text: "red" },
    { id: 2, text: "blue" },
    { id: 3, text: "green" },
    { id: 4, text: "gray", isDisabled: true },
  ];
}

Angular

import { Component, NgModule } from "@angular/core";
import { FormsModule } from "@angular/forms";

@Component({
  selector: "app-color-select",
  template: `
    <select [(ngModel)]="selectedColorId">
      <option
        *ngFor="let color of colors"
        [value]="color.id"
        [disabled]="color.isDisabled"
      >
        {{ color.text }}
      </option>
    </select>
  `,
})
export class ColorSelectComponent {
  selectedColorId = 2;

  colors = [
    { id: 1, text: "red" },
    { id: 2, text: "blue" },
    { id: 3, text: "green" },
    { id: 4, text: "gray", isDisabled: true },
  ];
}

@NgModule({
  declarations: [ColorSelectComponent],
  imports: [FormsModule],
  exports: [ColorSelectComponent],
})
export class ColorSelectModule {}

Webapp features

Render app

Angular Renaissance

<!DOCTYPE html>
<html>
  <body>
    <app-root></app-root>
  </body>
</html>

Angular

<!DOCTYPE html>
<html>
  <body>
    <app-root></app-root>
  </body>
</html>

Fetch data

Angular Renaissance

import { HttpClient } from "@angular/common/http";
import { inject, Injectable, signal } from "@angular/core";

export interface UsersState {
  users: User[];
  error: string | null;
  loading: boolean;
}

export const initialState: UsersState = {
  users: [],
  error: null,
  loading: false,
};

@Injectable({ providedIn: "root" })
export class UserService {
  private http = inject(HttpClient);

  #state = signal<UsersState>(initialState);
  state = this.#state.asReadonly();

  loadUsers() {
    this.#state.update((state) => ({ ...state, loading: true }));

    this.http
      .get<UserResponse>("https://randomuser.me/api/?results=3")
      .subscribe({
        next: ({ results }) =>
          this.#state.update((state) => ({ ...state, users: results })),
        error: (error) => this.#state.update((state) => ({ ...state, error })),
      });
  }
}

Angular

import { HttpClient } from "@angular/common/http";
import { Injectable } from "@angular/core";
import { BehaviorSubject } from "rxjs";

export interface UsersState {
  users: User[];
  error: string | null;
  loading: boolean;
}

export const initialState: UsersState = {
  users: [],
  error: null,
  loading: false,
};

@Injectable({ providedIn: "root" })
export class UserService {
  private state = new BehaviorSubject<UsersState>(initialState);
  state$ = this.state.asObservable();

  constructor(private http: HttpClient) {}

  loadUsers() {
    this.state.next({ ...initialState, loading: true });

    this.http
      .get<UserResponse>("https://randomuser.me/api/?results=3")
      .subscribe({
        next: ({ results }) =>
          this.state.next({ ...initialState, users: results }),
        error: (error) => this.state.next({ ...initialState, error }),
      });
  }
}

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