Chapter 8

1. A promise is an object that represents the result of an asynchronous operation. The use of promises simplifies the code when performing asynchronous calls.
2. The fetch API provides the fetch(), which method that you can use to make asynchronous calls using JavaScript.
3. When using the REST API, it is recommended that you use the fetch() call inside the componentDidMount() life cycle method that is invoked when the component has been mounted.
4. You can access the response data using the promises with the fetch() method. The data from the response is saved to the state and the component is rerendered when the state changes.