fix bugs and add comments

test.js

@@ -13,23 +13,26 @@ const createStore = (reducer, initialState) => {
 
     const subscribe = listener => listeners.push(listener)
 
-    return { getState, dispatch, subscribe }
+    return {getState, dispatch, subscribe}
 }
 
 const connect = (mapStateToProps, mapDispatchToProps) =>
     Component => {
+        // need add window for store (store is global odj) and put props into component
         return class extends React.Component {
             render() {
                 return (
                     <Component
-                        {...mapStateToProps(store.getState(), this.props)}
-                        {...mapDispatchToProps(store.dispatch, this.props)}
+                        {...this.props}
+                        {...mapStateToProps(window.store.getState(), this.props)}
+                        {...mapDispatchToProps(window.store.dispatch, this.props)}
                     />
                 )
             }
 
             componentDidMount() {
-                store.subscribe(this.handleChange)
+                // stor is global in Provider
+                window.store.subscribe(this.handleChange)
             }
 
             handleChange = () => {
@@ -61,7 +64,7 @@ const addTodo = todo => ({
 
 // reducers
 const reducer = (state = [], action) => {
-    switch(action.type) {
+    switch (action.type) {
         case ADD_TODO:
             state.push(action.payload)
             return state
@@ -88,23 +91,31 @@ class ToDoComponent extends React.Component {
                     />
                     <button onClick={this.addTodo}>Добавить</button>
                     <ul>
+                        {/*need use key for array*/}
                         {this.props.todos.map((todo, idx) => <li>{todo}</li>)}
                     </ul>
                 </div>
             </div>
         )
     }
 
-    updateText(e) {
-        const { value } = e.target
-
-        this.state.todoText = value
+    // updateText has own this and this.state is not avalible
+    // can create like arrow func without own this
+    updateText = (e) => {
+        const value = e.target.value
+        // for state updating, need use setState()
+        this.setState({todoText: value})
     }
 
-    addTodo() {
-        this.props.addTodo(this.state.todoText)
-
-        this.state.todoText = ''
+    addTodo = () => {
+        //check for empty input
+        if (this.state.todoText !== '') {
+            this.props.addTodo(this.state.todoText)
+            // for state updating, need use setState()
+            this.setState({todoText: ""})
+        } else {
+            console.log('WARNING - an attempt to add an empty value to the TODO list')
+        }
     }
 }