Angular Academy · Lesson

Selectors and Effects

Handle state efficiently with selectors and effects.

Lesson 3 of 310 steps

Selectors and Effects is a free Angular Academy lesson on CoddyKit. This is lesson 3 of 3. Any 3 lessons of this learning path are free to read in full — after that, CoddyKit PRO unlocks every lesson, plus hands-on practice with a built-in code editor and a 24/7 AI tutor. It is part of the Angular Academy learning path, and your progress syncs across the web and the CoddyKit app. The Angular Academy course includes 3 lessons in total.

Selectors and Effects in NgRx

This lesson covers selectors and effects, crucial parts of NgRx for efficient state management in Angular.

What are Selectors?

Selectors allow you to efficiently retrieve specific pieces of state from the store, optimizing data access.

Creating Selectors

Create selectors using createSelector() function to select data from state efficiently:

export const selectUser = createSelector(
  (state: AppState) => state.user,
  (user) => user.details
);

Using Selectors in Components

Selectors help you access store data easily within components:

this.store.select(selectUser).subscribe(user => console.log(user));

What are Effects?

Effects handle side effects in NgRx, such as HTTP requests, by listening for actions and performing asynchronous operations.

Installing Effects

Install NgRx Effects using:

npm install @ngrx/effects --save

Creating Effects

Effects handle side effects like HTTP requests triggered by actions:

loadUser$ = createEffect(() =>
  this.actions$.pipe(
    ofType(loadUser),
    mergeMap(() => this.userService.getUser().pipe(
      map(user => loadUserSuccess({ user }))
    ))
  )
);

Registering Effects

EffectsModule.forRoot([UserEffects])

Selectors and Effects Summary

Summary

You now understand selectors and effects in NgRx, empowering you to handle state and side-effects efficiently. Excellent job!

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Frequently Asked Questions

Is the “Selectors and Effects” lesson free?

Yes — any 3 lessons of the Angular Academy learning path, including “Selectors and Effects”, are free to read in full here on the web. After that, CoddyKit PRO unlocks every lesson, plus interactive practice with a built-in code editor and a 24/7 AI tutor. The Angular Academy course includes 3 lessons in total.

What will I learn in “Selectors and Effects”?

Handle state efficiently with selectors and effects. You practise Angular Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Angular Academy?

No prior experience is required. Angular Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 3 of 3.

How long does the “Selectors and Effects” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Angular Academy lesson?

Yes. Every Angular Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

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