Module 3

Hallucination drills

Each item is a confident, wrong answer an AI produced. Pick the flaw. Your answer is checked on the server -- the fix is revealed only after you commit.

event-loop
Proving timer order with a two-line experimentcode
event-loopFree
Making a heavy parse non-blockingcode
event-loop
How Node contains a slow handlerprose
event-loop
Yielding to the loop between work batchescode
v8-memory
Fast buffer allocation with a built-in guardcode
v8-memory
When V8 schedules garbage collectionprose
v8-memory
A cache that cleans up after itselfcode
v8-memory
Sizing the heap for a buffer-heavy serviceprose
streams-backpressure
Streaming a CSV into a database one record at a timecode
streams-backpressure
What highWaterMark guaranteesprose
streams-backpressure
A one-line uppercase transformcode
streams-backpressure
Error handling for a pipe chaincode
errors-reliability
Guarding a file read with try/catchcode
errors-reliability
What an unhandled rejection does to a serviceprose
errors-reliabilityFree
A clean exit after writing a reportcode
errors-reliability
Centralized error handling for an Express APIcode
modules-packaging
Using require inside an ES modulecode
modules-packaging
How many times a module executesprose
modules-packaging
Two modules that require each othercode
modules-packaging
main versus exports in package.jsonprose
concurrency-scaling
Sharing a counter with a worker threadcode
concurrency-scaling
An in-process cache behind clusterprose
concurrency-scaling
Password hashing in a request handlercode
concurrency-scaling
How cluster distributes connectionsprose
http-networking
Adding a header after streaming beginscode
http-networking
Whether Node reuses outbound connectionsprose
http-networking
Reading a JSON body in a raw Node servercode
http-networking
DNS in the HTTP client hot pathprose
securityFree
What a JWT hides from the clientprose
security
Constant-time comparison for API keyscode
security
A session token from Math.randomcode
security
Freezing the prototype to stop pollutionprose
performance-observability
Logging every request to a filecode
performance-observability
A non-blocking delay from the timers modulecode
performance-observability
Reading throughput off a single benchmark runprose
performance-observability
Whether an unbounded cache can leakprose
ai-workflow
An AI-written test that proves the fixcode
ai-workflow
A test claiming a validator rejects bad inputcode
ai-workflow
An assistant citing a config defaultprose
ai-workflow
A parallel refactor of sequential awaitscode