In the search for "action.payload" using Redux Toolkit

Question

In the search for "action.payload" using Redux Toolkit

const userSlice = createSlice({
  name: 'user',
  initialState,
  reducers: {
    // Setting the user
    setUser: (state, action: PayloadAction<string | null>) => {
      state.user.email = action.payload;
    },
    setLoading: (state, action: PayloadAction<boolean>) => {
      state.isLoading = action.payload;
    },
  },
});

I'm seeking clarification on the usage and purpose of action.payload in this context. Can someone please explain its significance?

typescript redux redux-toolkit

Answer 1

Answer №1

When working with the Redux-Toolkit (RTK) slice:

const userSlice = createSlice({
  name: 'user',
  initialState,
  reducers: {
    // Sets the user
    setUser: (state, action: PayloadAction<string | null>) => {
      state.user.email = action.payload;
    },
    setLoading: (state, action: PayloadAction<boolean>) => {
      state.isLoading = action.payload;
    },
  },
});

and using these exports:

export const { setUser, setLoading } = userSlice.actions;
export default userSlice.reducer;

This RTK slice creates the following key exports:

Generates setUser and setLoading functions based on the declared reducer functions.
A slice reducer function that is utilized in creating the store object or combined with other reducers to form a reducer tree when configuring the store, e.g. configureStore.

The purpose of action.payload needs clarification. Why is it used here and what role does it play?

All Redux action functions produce an action object, typically containing a type property. Actions generated by RTK include an additional payload property within the action object. This action.payload is referenced in the reducer functions.

For instance, dispatching the setUser action from the UI.

dispatch(setUser("Drew"));

dispatch(setUser(null));

This triggers the setUser action with either the string argument "Drew" or null, resulting in an action object

{ type: "user/setUser", payload: "Drew" }

or

{ type: "user/setUser", payload: null }

. The dispatched action is then processed by the dispatch function, akin to

dispatch({ type: "user/setUser", payload: "Drew" })

, before reaching the reducer tree.

The setReducer function manages this specific "user/setUser" action type and extracts the payload property from the action object.

setUser: (state, action: PayloadAction<string | null>) => {
  state.user.email = action.payload; // Either "Drew" or null
}

As a result, the value stored in state.user.email is set to the received payload value "Drew".

Similarly, you can pass a boolean value when triggering the setLoading action.

dispatch(setLoading(true));

setLoading: (state, action: PayloadAction<boolean>) => {
  state.isLoading = action.payload; // true
},

Answer 2

When working with the Redux-Toolkit (RTK) slice:

const userSlice = createSlice({
  name: 'user',
  initialState,
  reducers: {
    // Sets the user
    setUser: (state, action: PayloadAction<string | null>) => {
      state.user.email = action.payload;
    },
    setLoading: (state, action: PayloadAction<boolean>) => {
      state.isLoading = action.payload;
    },
  },
});

and using these exports:

export const { setUser, setLoading } = userSlice.actions;
export default userSlice.reducer;

This RTK slice creates the following key exports:

Generates setUser and setLoading functions based on the declared reducer functions.
A slice reducer function that is utilized in creating the store object or combined with other reducers to form a reducer tree when configuring the store, e.g. configureStore.

The purpose of action.payload needs clarification. Why is it used here and what role does it play?

All Redux action functions produce an action object, typically containing a type property. Actions generated by RTK include an additional payload property within the action object. This action.payload is referenced in the reducer functions.

For instance, dispatching the setUser action from the UI.

dispatch(setUser("Drew"));

dispatch(setUser(null));

This triggers the setUser action with either the string argument "Drew" or null, resulting in an action object

{ type: "user/setUser", payload: "Drew" }

or

{ type: "user/setUser", payload: null }

. The dispatched action is then processed by the dispatch function, akin to

dispatch({ type: "user/setUser", payload: "Drew" })

, before reaching the reducer tree.

The setReducer function manages this specific "user/setUser" action type and extracts the payload property from the action object.

setUser: (state, action: PayloadAction<string | null>) => {
  state.user.email = action.payload; // Either "Drew" or null
}

As a result, the value stored in state.user.email is set to the received payload value "Drew".

Similarly, you can pass a boolean value when triggering the setLoading action.

dispatch(setLoading(true));

setLoading: (state, action: PayloadAction<boolean>) => {
  state.isLoading = action.payload; // true
},

In the search for "action.payload" using Redux Toolkit

Answer №1

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