Reducer handlers

This package is a new approach for redux reducer implementation. Reducer handlers are simple dictionary map handlers and consist of small testable functions.

Installation

$ npm install reducer-handlers
$ yarn add reducer-handlers

##Usage

import { generateUpdateStateHandler, generateReducer, dispatchAction } from 'reducer-handlers';

For a good practice of redux reducer implementation, you can organise your default states and action types as separate files.

// defaultState.js

export const stateKeys = {
  someState: 'someState',
  someState2: 'someState2',
};

export const defaultState = {
  [stateKeys.someState]: '',
  [stateKeys.someState2]: {},
};

// actionTypes.js

export const GET_SOME_STATE = 'SOME/GET_SOME_STATE';
export const GET_SOME_STATE2 = 'SOME/GET_SOME_STATE2';

Reducer Handler Usage

After defining default states and action types, now you are ready to create your first reducer.js. Here I introduce you generateUpdateStateHandler and generateReducer reducer handlers. generateUpdateStateHandler updates your states whereas generateReducer gets among your handlers by action types.

// reducer.js

import { generateUpdateStateHandler, generateReducer } from 'reducer-handlers';
import { stateKeys, defaultState } from './defaultState';
import { GET_SOME_STATE, GET_SOME_STATE2 } from './actionTypes';

const handlers = {};
handlers[GET_SOME_STATE] = generateUpdateStateHandler(stateKeys.someState);
handlers[GET_SOME_STATE2] = generateUpdateStateHandler(stateKeys.someState2);

export default generateReducer(defaultState, handlers);

Action Handler Usage

Here is a simple action implementation. For a quick introduction; dispatchAction creates and dispatches your new result.

// getGetSomeAction.js

import { dispatchAction } from 'reducer-handlers';
import { GET_SOME_STATE } from './actionTypes';

export const getGetSomeAction = () => {
  return async dispatch => {
    //some code here.
    const result = '... //code returned from some code';
    return dispatchAction(dispatch)(GET_SOME_STATE, result);
  };
};

License

MIT