Actions and Reducers
Manage state using actions and reducers.
Actions and Reducers is a free Angular Academy lesson on CoddyKit. This is lesson 2 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.
Introduction to Actions and Reducers
Actions and Reducers
Learn about managing state in NgRx applications using actions and reducers.
What are Actions?
Actions describe unique events or actions in your application, such as loading data or user interactions.
Creating Actions
Create actions using createAction():
export const login = createAction('[Login Page] Login');Action Payloads
Pass data with actions using payload:
export const loadUser = createAction('[User] Load', props<{ userId: number }>());Reducers
Reducers handle state transitions based on actions. They return new states without mutating existing state directly.
Creating Reducers
Use createReducer to define how state changes:
export const userReducer = createReducer(
initialState,
on(loadUser, (state, action) => ({ ...state, user: action.userId }))Updating State
Reducers must always return new state objects. Never mutate the existing state directly.
on(loadUser, (state, action) => ({ ...state, user: action.userId }))Combining Reducers
Combine multiple reducers into one root reducer for managing complex states:
StoreModule.forRoot({ users: userReducer, posts: postReducer })Actions and Reducers Summary
Summary
You learned about creating actions and reducers to manage state effectively in Angular with NgRx!
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- Courses
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Frequently Asked Questions
Is the “Actions and Reducers” lesson free?
Yes — any 3 lessons of the Angular Academy learning path, including “Actions and Reducers”, 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 “Actions and Reducers”?
Manage state using actions and reducers. 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 2 of 3.
How long does the “Actions and Reducers” 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.
All lessons in this course
- NgRx Store Essentials
- Actions and Reducers
- Selectors and Effects