exact-resistor-calculator/src/reducers/menu.js

import React, {Component} from 'react';
import * as types from '../actions/actionTypes';

import CalcApp from '../containers/calcApp';
import HelpApp from '../containers/helpApp';

const initialState = {
	isOpen: false,
	refdrawer: null,
	page: <CalcApp />,
	subtitle: 'Calculator Page',
};

export default function menu(state = initialState, action = {}) {
	switch (action.type) {
		case types.MENUOPEN:
			return {
				...state,
				isOpen: true,
			};
		case types.MENUCLOSE:
			return {
				...state,
				isOpen: false,
			};
		case types.MAIN:
			return {
				...state,
				isOpen: false,
				page: <CalcApp />,
				subtitle: 'Calculator Page',
			};
		case types.HELP:
			return {
				...state,
				isOpen: false,
				page: <HelpApp />,
				subtitle: 'Help',
			};
		default:
			return state;
	}
}