AsynchronousLesson 10Free preview
Node Async
This lesson is part of Node.js · All levels
Summary
Asynchronous programming allows Node to complete heavy operations such as file reading without blocking the main thread. This concept is represented by callback, which is a function called when the job is done. Understanding these patterns is key to making the most of Node's power.
Key points
- Asynchronous operations run in the background and report results via callback
- Node uses the error-first callback pattern: (err, result)
- Blocking I/O makes the server non-scalable, non-blocking I/O maintains responsiveness
- Async can also be used for schedule tasks such as intervals and timers
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