redux reducer
const reducer = (state = initialState, action) => {
switch (action.type) {
case "BUY_CAKE":
return {
numOfCakes: state.numOfCakes - 1,
};
default:
return state;
}
};redux reducer
const reducer = (state = initialState, action) => {
switch (action.type) {
case "BUY_CAKE":
return {
numOfCakes: state.numOfCakes - 1,
};
default:
return state;
}
};How reducer works in redux
const initialState = { value: 0 }
function counterReducer(state = initialState, action) {
// Check to see if the reducer cares about this action
if (action.type === 'counter/increment') {
// If so, make a copy of `state`
return {
...state,
// and update the copy with the new value
value: state.value + 1
}
}
// otherwise return the existing state unchanged
return state
}redux reducer example
import * as ActionTypes from './ActionTypes';
export const comments = (state = { errMess: null, comments: []}, action) => {
switch (action.type) {
case ActionTypes.ADD_COMMENTS:
return {...state, errMess: null, comments: action.payload};
case ActionTypes.COMMENTS_FAILED:
return {...state, errMess: action.payload};
default:
return state;
}
};Copyright © 2021 Codeinu
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