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← All coursesThe Event Loop You Stopped Drawing6 levels · 28 lessons

Nothing interrupts a running stack~7 min
Treat timer delays as minimums~5 min
Drain the right queue first~6 min
Read await as a pause, not a wait~6 min
The Machine · Review~5 min

Count the hops in a promise chain~6 min
Bet on which resolution pays extra hops~6 min
Predict what deferred callbacks see~6 min
Get the concurrency you wrote~6 min
Scheduled Hops · Review~5 min

Catch the Checkpoint Mid-Event~7 min
Trace Where an Async Throw Lands~6 min
Step a Paused Stack Frame by Hand~7 min
The Checkpoint, Precisely · Review~5 min

Starve the frame on purpose~7 min
Put your code before the paint~7 min
See the ticks inside for await~6 min
The Loop Meets the Screen · Review~5 min

Place a callback in the phase that fires it~7 min
Know when you can't predict the order~6 min
Spot the line that stalls every request~6 min
Trace where a rejection escapes the process~6 min
The Loop Has Phases · Review~5 min

Carry request identity through awaits~7 min
Decide which workload leaves the main thread~6 min
Cancel work you already started~6 min
Consume a stream and exit it safely~6 min
One Thread, Many Escapes · Review~5 min

Course

The Event Loop You Stopped Drawing

Predict every log line again.

Start free: Nothing interrupts a running stack