From 826dcb467f374d97c19abcaccc386b27f2596b7e Mon Sep 17 00:00:00 2001
From: Arthur Denner <arthurdenner7@gmail.com>
Date: Mon, 4 Mar 2019 15:32:34 -0300
Subject: [PATCH] Fix convert undefined to object

Trying to execute `Object.keys` in `undefined` throws an error. Defaulting the value to an empty object returns an empty array.
---
 step1-06/demo/src/components/TodoList.tsx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/step1-06/demo/src/components/TodoList.tsx b/step1-06/demo/src/components/TodoList.tsx
index aeacb25..04987b2 100644
--- a/step1-06/demo/src/components/TodoList.tsx
+++ b/step1-06/demo/src/components/TodoList.tsx
@@ -3,7 +3,7 @@ import { TodoListItem } from './TodoListItem';
 
 export class TodoList extends React.Component<any, any> {
   render() {
-    const { filter, todos } = this.props;
+    const { filter, todos = {} } = this.props;
 
     // filteredTodos returns an array of filtered todo keys [01,02,03]
     const filteredTodos = Object.keys(todos).filter(id => {