Master callbacks, Promises, async/await, the event loop, microtasks, and async streaming with hands-on examples
Sub Category
- Programming Languages
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Objectives
- Understand why JavaScript is single-threaded and how non-blocking I/O keeps it responsive
- Write and refactor callback code, including error-first callbacks, and recognize callback hell
- Create, consume, chain, and combine Promises with all, allSettled, race, and any
- Use async and await fluently, including try/catch error handling and cancellation with AbortController
- Avoid the sequential-await performance trap and the forEach async trap in loops
- Explain the event loop, microtask and macrotask queues, and predict exact execution order
- Build async generators, hand-written async iterators, and streaming pipelines with backpressure and bounded concurrency
- Spot async race conditions and anti-patterns and design a sound error-handling strategy
Pre Requisites
- Working knowledge of JavaScript syntax: variables, functions, arrays, and objects
- Comfort writing and running basic JavaScript in a browser or Node.js
- Familiarity with using a terminal or command line
- A computer running Windows, macOS, or Linux with a modern browser or Node installed
- No prior experience with Promises, async/await, or the event loop required
FAQ
- Q. How long do I have access to the course materials?
- A. You can view and review the lecture materials indefinitely, like an on-demand channel.
- Q. Can I take my courses with me wherever I go?
- A. Definitely! If you have an internet connection, courses on Udemy are available on any device at any time. If you don't have an internet connection, some instructors also let their students download course lectures. That's up to the instructor though, so make sure you get on their good side!
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