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Fix convert undefined to object

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Trying to execute `Object.keys` in `undefined` throws an error. Defaulting the value to an empty object returns an empty array.
This commit is contained in:
Arthur Denner
2019-03-04 15:32:34 -03:00
committed by GitHub
parent a4097d417c
commit 826dcb467f
1 changed files with 1 additions and 1 deletions
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step1-06/demo/src/components/TodoList.tsx
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@@ -3,7 +3,7 @@ import { TodoListItem } from './TodoListItem';
export class TodoList extends React.Component<any, any> { export class TodoList extends React.Component<any, any> {
render() { render() {
const { filter, todos } = this.props; const { filter, todos = {} } = this.props;
// filteredTodos returns an array of filtered todo keys [01,02,03] // filteredTodos returns an array of filtered todo keys [01,02,03]
const filteredTodos = Object.keys(todos).filter(id => { const filteredTodos = Object.keys(todos).filter(id => {