Which reducer gets used when using dispatch in mapDispatchToProps? [duplicate] - reactjs

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All reducers will be invoked when an action is dispatched?
(3 answers)
Closed 2 years ago.
I am learning about Redux and I have two reducers, a contactReducer to show contacts on the page and a testReducer to just mess around with. In one of my component files I have this function:
const mapDispatchToProps = (dispatch) => ({
getContacts: () => dispatch({ type: "TEST_ACTION" }),
});
These are my two reducer files:
contactReducer:
import { GET_CONTACTS } from "../actions/types";
const initialState = {
contacts: [
{
id: 1,
name: "John Doe",
email: "john#gmail.com",
phone: "555-555-5555",
},
{
id: 2,
name: "Karen Williams",
email: "karen#gmail.com",
phone: "444-444-4444",
},
{
id: 3,
name: "Henry Johnson",
email: "henry#gmail.com",
phone: "333-333-333",
},
],
};
export default function (state = initialState, action) {
switch (action.type) {
case GET_CONTACTS:
return {
...state,
};
default:
console.log("testing action in contactReducer");
return state;
}
}
and testReducer:
import { GET_CONTACTS } from "../actions/types";
const initialState = {
contactsTest: [
{
id: 1,
name: "ffffffffffff",
email: "john#gmail.com",
phone: "555-555-5555",
},
{
id: 2,
name: "ggggggggggggg",
email: "karen#gmail.com",
phone: "444-444-4444",
},
{
id: 3,
name: "aaaaaaaaaaaaaa",
email: "henry#gmail.com",
phone: "333-333-333",
},
],
};
export default function (state = initialState, action) {
switch (action.type) {
case "TEST_ACTION":
return {
...state,
};
default:
console.log("testing action");
return state;
}
}
So, what I noticed from the console.log statements in the reducer files was that for every contact, both the contactReducer and testReducer's function was called with this line:
getContacts: () => dispatch({ type: "TEST_ACTION" }),
});
What if I have multiple reducers but I only want to call one of their functions for dispatch, what would I do?

Answer 1

combineReducers, Is a helper function in redux that helps you divide your reducers. take a look at this link: LINK