set up demo, exercise, final folders

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

@@ -0,0 +1,27 @@
+import React from 'react';
+import { TodoListItem } from './TodoListItem';
+import { FilterTypes, Todos } from '../TodoApp.types';
+
+interface TodoListProps {
+  complete: (id: string) => void;
+  todos: Todos;
+  filter: FilterTypes;
+}
+
+export class TodoList extends React.Component<TodoListProps, 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>
+    );
+  }
+}