adding back docs

docs/step1-07/demo/src/TodoApp.tsx

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+import React from 'react';
+import { TodoFooter } from './components/TodoFooter';
+import { TodoHeader } from './components/TodoHeader';
+import { TodoList } from './components/TodoList';
+import { Todos, FilterTypes } from './TodoApp.types';
+
+let index = 0;
+
+export class TodoApp extends React.Component<any, any> {
+  constructor(props) {
+    super(props);
+    this.state = {
+      todos: {},
+      filter: 'all'
+    };
+  }
+
+  render() {
+    const { filter, todos } = this.state;
+    return (
+      <div>
+        <TodoHeader addTodo={this._addTodo} setFilter={this._setFilter} filter={filter} />
+        <TodoList complete={this._complete} todos={todos} filter={filter} />
+        <TodoFooter clear={this._clear} todos={todos} />
+      </div>
+    );
+  }
+
+  // business logic
+
+  private _addTodo = label => {
+    const { todos } = this.state;
+    const id = index++;
+
+    this.setState({
+      todos: { ...todos, [id]: { label, completed: false } }
+    });
+  };
+
+  private _complete = id => {
+    const newTodos = { ...this.state.todos };
+    newTodos[id].completed = !newTodos[id].completed;
+
+    this.setState({
+      todos: newTodos
+    });
+  };
+
+  private _clear = () => {
+    const { todos } = this.state;
+    const newTodos = {};
+
+    Object.keys(this.state.todos).forEach(id => {
+      if (!todos[id].completed) {
+        newTodos[id] = todos[id];
+      }
+    });
+
+    this.setState({
+      todos: newTodos
+    });
+  };
+
+  private _setFilter = filter => {
+    this.setState({
+      filter: filter
+    });
+  };
+}

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

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+export type FilterTypes = 'all' | 'active' | 'completed';
+
+export interface TodoItem {
+  label: string;
+  completed: boolean;
+}
+
+export interface Todos {
+  [id: string]: TodoItem;
+}

docs/step1-07/demo/src/components/TodoFooter.tsx

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+import React from 'react';
+import { Todos } from '../TodoApp.types';
+
+export const TodoFooter = (props: any) => {
+  const itemCount = Object.keys(props.todos).filter(id => !props.todos[id].completed).length;
+  return (
+    <footer>
+      <span>
+        {itemCount} item{itemCount > 1 ? 's' : ''} left
+      </span>
+      <button className="submit">Clear Completed</button>
+    </footer>
+  );
+};

docs/step1-07/demo/src/components/TodoHeader.tsx

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+import React from 'react';
+import { FilterTypes } from '../TodoApp.types';
+
+export class TodoHeader extends React.Component<any, any> {
+  constructor(props) {
+    super(props);
+    this.state = { labelInput: '' };
+  }
+
+  render() {
+    const { filter } = this.props;
+    return (
+      <header>
+        <h1>todos</h1>
+        <div className="addTodo">
+          <input value={this.state.labelInput} onChange={this._onChange} className="textfield" placeholder="add todo" />
+          <button className="submit">Add</button>
+        </div>
+        <nav className="filter">
+          <button className={filter == 'all' ? 'completed' : ''}>all</button>
+          <button className={filter == 'active' ? 'completed' : ''}>active</button>
+          <button className={filter == 'completed' ? 'completed' : ''}>completed</button>
+        </nav>
+      </header>
+    );
+  }
+
+  _onChange = evt => {
+    this.setState({ labelInput: evt.target.value });
+  };
+}

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

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+import React from 'react';
+import { TodoListItem } from './TodoListItem';
+import { FilterTypes, Todos } from '../TodoApp.types';
+
+export class TodoList extends React.Component<any, any> {
+  render() {
+    const { filter, todos, complete } = this.props;
+
+    const filteredTodos = Object.keys(todos).filter(id => {
+      return filter === 'all' || (filter === 'completed' && todos[id].completed) || (filter === 'active' && !todos[id].completed);
+    });
+
+    return (
+      <ul className="todos">
+        {filteredTodos.map(id => (
+          <TodoListItem key={id} id={id} complete={complete} {...todos[id]} />
+        ))}
+      </ul>
+    );
+  }
+}

docs/step1-07/demo/src/components/TodoListItem.tsx

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+import React from 'react';
+import { TodoItem } from '../TodoApp.types';
+
+export class TodoListItem extends React.Component<any, any> {
+  render() {
+    const { label, completed } = this.props;
+
+    return (
+      <li className="todo">
+        <label>
+          <input type="checkbox" checked={completed} /> {label}
+        </label>
+      </li>
+    );
+  }
+}

docs/step1-07/demo/src/index.tsx

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+import React from 'react';
+import ReactDOM from 'react-dom';
+import { TodoApp } from './TodoApp';
+ReactDOM.render(<TodoApp />, document.getElementById('app'));

docs/step1-07/demo/src/style.css

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+body {
+  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
+  width: 400px;
+  margin: 20px auto;
+}
+
+h1 {
+  text-align: center;
+}
+
+.addTodo {
+  display: flex;
+}
+
+.textfield {
+  flex-grow: 1;
+  margin-right: 10px;
+}
+
+.submit {
+  border: none;
+  padding: 5px 10px;
+}
+
+.filter {
+  margin: 10px 0 0;
+}
+
+.filter button {
+  background: transparent;
+  border: none;
+}
+
+.filter .selected {
+  border-bottom: 2px solid blue;
+}
+
+.todos {
+  list-style: none;
+  padding: 0;
+}
+
+footer {
+  display: flex;
+}
+
+footer span {
+  flex-grow: 1;
+}