Learn how to create a React todo list application using the reducers we wrote before.

 

/** * A reducer for a single todo * @param state * @param action * @returns {*} */const todo = ( state, action ) => {    switch ( action.type ) {        case 'ADD_TODO':            return {                id: action.id,                text: action.text,                completed: false            };        case 'TOGGLE_TODO':            if ( state.id !== action.id ) {                return state;            }            return {                ...state,                completed: !state.completed            };        default:            return state;    }};/** * The reducer for the todos * @param state * @param action * @returns {*} */const todos = ( state = [], action ) => {    switch ( action.type ) {        case 'ADD_TODO':            return [                ...state,                todo( undefined, action )            ];        case 'TOGGLE_TODO':            return state.map( t => todo( t, action ) );        default:            return state;    }};/** * Reducer for the visibilityFilter * @param state * @param action * @returns {*} */const visibilityFilter = ( state = 'SHOW_ALL',                           action ) => {    switch ( action.type ) {        case 'SET_VISIBILITY_FILTER':            return action.filter;        default:            return state;    }};/** * combineReducers: used for merge reducers togethger * createStore: create a redux store */const { combineReducers, createStore } = Redux;const todoApp = combineReducers( {    todos,    visibilityFilter} );const store = createStore( todoApp );/** * For generate todo's id * @type {number} */let nextTodoId = 0;/** * React related */const {Component} = React;class TodoApp extends Component {    render() {        return (            
     
                
      {            this.input = node        }    }/>                
      {        //After clicking the button, dispatch a add todo action            store.dispatch({                type: 'ADD_TODO',                id: nextTodoId++,                text: this.input.value            })            this.input.value = "";        }    }>ADD todo                                
      
                           //loop thought the todo list                    {
   this.props.todos.map( ( todo )=> {                        return 
       
{todo.text}
                    } )}                
      
            
     
        );    }}const render = () => {    ReactDOM.render(        
     
      ,        document.getElementById( 'root' )    );};//Every time, store updated, also fire the render() functionstore.subscribe( render );render();