Asynchronous functions are functions that work asynchronously. They return a Promise class implicitly and can run concurrently. We will be discussing two major ways to define asynchronous functions. These include the following:
- Using the native Promise class
- Using the modern Async keyword
The await keyword is used inside an asynchronous function to resolve a promise. Async and await are usually used together for managing the control of flow in a modern asynchronous JavaScript application. Koa relies heavily on async.. await to avoid callback hell and provide a more convenient method for handling errors.