Async Patterns & Control Flow

6 topics in this chapter

1

Callback Patterns and Error-First Convention

Error-first callbacks, sync vs async invocation, callback hell, and how Node's core APIs enforce the convention.

#nodejs#callbacks#error-first#async-patterns#control-flow

28 min read

2

Promises and Microtask Scheduling

Promise state machines, the microtask queue, V8's internal slots, thenable assimilation, and scheduling order.

#nodejs#promises#microtasks#async-patterns#v8

29 min read

3

Async/Await Under the Hood

How V8 compiles async functions into state machines, suspend/resume mechanics, and the implicit promise wrapping.

#nodejs#async-await#state-machine#v8#async-patterns

29 min read

4

EventEmitter Internals

The _events object, synchronous dispatch, listener storage optimizations, the error event contract, and memory leak warnings.

#nodejs#eventemitter#events#async-patterns#observer-pattern

34 min read

5

Async Iterators and for-await-of

The async iteration protocol, Symbol.asyncIterator, for-await-of mechanics, and backpressure with async generators.

#nodejs#async-iterators#for-await-of#async-generators#async-patterns

29 min read

6

Promise Combinators and Advanced Patterns

Promise.all, allSettled, race, any -- short-circuit semantics, failure propagation, and concurrency limiting patterns.

#nodejs#promise-combinators#promise-all#promise-race#async-patterns

31 min read

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