dispatch action redux code example

Example 1: redux action

import { createActions, handleActions, combineActions } from 'redux-actions';

const defaultState = { counter: 10 };

const { increment, decrement } = createActions({
  INCREMENT: (amount = 1) => ({ amount }),
  DECREMENT: (amount = 1) => ({ amount: -amount })
});

const reducer = handleActions({  
  [combineActions(increment, decrement)]: (state, action) => {
      return { ...state, counter: state.counter + action.payload.amount };
    }
  },
  defaultState
);

export default reducer;

Example 2: dispatch two actions in redux

export const topLevelAction = () => dispatch => {
    return Promise.all([dispatch(action1()), dispatch(action2()), dispatch(action3())])
}

Example 3: redux acions

//npm i redux-actions or yarn add redux-actions

// single action creator
export const incAsyncCreator = createAction("INC");
export const decAsyncCreator = createAction("DEC");

// single action creator using - single reducer 
export const incReducer = handleAction(
  incAsyncCreator,
  (state, action) => ({
    ...state,
    counter: state.counter + 1,
    success: action.payload.success
  }),
  counterState
);

// single action creator using - single reducer 
export const decReducer = handleAction(
  incAsyncCreator,
  (state, action) => ({
    ...state,
    counter: state.counter + 1,
    success: action.payload.success
  }),
  counterState
);


//multiple action creator
export const { increment, decrement } = createActions({
  increment: (payload) => ({ ...payload }),
  decrement: (payload) => ({ ...payload })
});

// multiple action creator using - multiple reducer 
export const counterReducer = handleActions(
  {
    [increment]: (state, action) => ({
      ...state,
      counter: state.counter + 1,
      success: action.payload.success
    }),
    [decrement]: (state, action) => ({
      ...state,
      counter: state.counter - 1,
      success: action.payload.success
    })
  },
  counterState
);

Example 4: what is dispatch in redux

function dispatch(action) {
  // check that the action argument is an object
  if (typeof action !== 'object' || obj === null) {
    throw new Error('actions must be plain object.');
  }

  // check that the action object has a 'type' property
  if (typeof action.type === 'undefined') {
    throw new Error('Actions may not have an undefined "type" property.');
  }

  // call the reducer and pass in currentState and action
  reducer(currentState, action);
}