Gist to create reducer in redux

createReducer.js

export function createReducer(reducerMap, defaultState) {
	return (state = { ...defaultState }, action) => reducerMap.hasOwnProperty(action.type) ? reducerMap[action.type](state, action) : state;
}

// Sample usage
posts: createReducer({
		[ALL_POSTS_RECEIVED]: (state, action) => { 
			//do something
		},
		[POSTS_REQUEST_IN_PROGRESS]: (state, action) => { 
			//do something
		}
	}, { posts: [], moreDataAvailable: true }),