Async-exit-hook

1. What is an exit hook example?
2. What is an exit hook?
3. How do async hooks work?
4. How can async hooks be used to monitor the lifetime of asynchronous resources?

What is an exit hook example?

Exit Hook Example

Nate is thinking about the day ahead when he's sees something that frightens him. The authors leaves the reader wanting to find out what Nate saw. Note that the authors doesn't tell us that Nate is frightened, but we know it.

What is an exit hook?

An entry hook is a routine that is called upon entry to each function in the program. An exit hook is a routine that is called upon exit of each function. Applications for hooks include debugging, trace, profiling, and stack overflow checking.

How do async hooks work?

The async_hooks module provides an API to register callbacks tracking the lifetime of asynchronous resources created inside a Node. js application. An asynchronous resource represents an object with an associated callback. This callback may be called multiple times, for example, the 'connection' event in net.

How can async hooks be used to monitor the lifetime of asynchronous resources?

Async Hooks is an Application Programming Interface (API) that enables tracking of asynchronous resources' lifetime. In other words, Async Hooks enable us to listen to events occurring in asynchronous resources. Any resource with a callback is an asynchronous resource; for instance, Timeouts and Immediate.