Chapter 1
Asynchronous APIs
Many browser APIs are asynchronous in nature. This chapter contains recipes for performing basic tasks asynchronously using callback functions, events, and Promises.
Examples
Recipe 1.1
Working With Promises
Load some data using a Promise-based API.
Recipe 1.2
Loading an Image With a Fallback
Load and show an image. In case of error, show a fallback image.
Recipe 1.3
Chaining Promises
Call a sequence of Promise APIs, where each depends on the result of the previous.
Recipe 1.4
Using the async and await Keywords
Load some data using a Promise-based API, and wait for the Promise with the await keyword.
Recipe 1.5
Using Promises in Parallel
Use Promise.all to run several asynchronous operations in parallel.
Recipe 1.6
Animating an Element with requestAnimationFrame
Asynchronously animate an element using the requestAnimationFrame API.
Recipe 1.7
Wrapping an Event API in a Promise
Create a Promise wrapper around an event-based API.
