readme cleanup

step1-07/demo/src/TodoApp.tsx

@@ -6,7 +6,12 @@ import { Todos, FilterTypes } from './TodoApp.types';
 
 let index = 0;
 
-export class TodoApp extends React.Component<any, any> {
+interface TodoAppState {
+  todos: Todos;
+  filter: FilterTypes;
+}
+
+export class TodoApp extends React.Component<any, TodoAppState> {
   constructor(props) {
     super(props);
     this.state = {

step1-07/demo/src/TodoApp.types.ts

@@ -1,5 +1,7 @@
 export type FilterTypes = 'all' | 'active' | 'completed';
 
+export type CompleteTodo = (id) => null;
+
 export interface TodoItem {
   label: string;
   completed: boolean;

step1-07/demo/src/components/TodoList.tsx

@@ -6,6 +6,7 @@ export class TodoList extends React.Component<any, any> {
   render() {
     const { filter, todos, complete } = this.props;
 
+    // filteredTodos returns an array of filtered todo keys [01,02,03]
     const filteredTodos = Object.keys(todos).filter(id => {
       return filter === 'all' || (filter === 'completed' && todos[id].completed) || (filter === 'active' && !todos[id].completed);
     });