simple reducers

reducers.js

export const visible = (state = 'SHOW_ALL', action) => {
    switch (action.type) {
        case 'SET_VISIBLE':
            return action.filter;
        default:
            return state;
    }
};

const toggleTodo = (todo, id) => {
    if (todo.id !== id) {
        return todo;
    }

    return Object.assign({}, todo, {
        completed: !todo.completed
    });
};

export const todos = (state = [], action) => {
    switch (action.type) {
        case 'CREATE_TODO':
            return [
                ...state,
                {
                    id: action.id,
                    text: action.text,
                    completed: false
                }
            ];
        case 'TOGGLE_TODO':
            return state.map(t => toggleTodo(t, action.id));
        default:
            return state;
    }
};

import { combineReducers } from 'redux';

export default combineReducers({ visible, todos });