Node.js Event Loop Presentation

1. start with riddle [-5->0]
2. what is event loop briefly [0->13]
3. list of building blocks [13->15]
4. question: importantly, what happens when they all get thrown together? how to grok? [15->16]
5. explain each building block; slowly build up picture of callstack in riddle [16->40]
6. summary of mental model; end with walking through solution of the riddle stack by stack [40->45]
7. author [45->46]
8. loupe tool [46->47]
9. Q&A; send off another riddle to ask for answers [47->50]

Presentation Tips

• zen mode (Ctrl + K, Z)
• remove git lens (disable extension)
• watch out for keyboard shortcuts when doing live-demo!
• call stack is properly ordered (add highest priority at top of file)
• add new sections over the presentation
• how does promise / catch work?
  • remains in the microtask queue execution, though further execution is aborted.
• what is the history of task queues?
  • Apparently microtask queues have been around since 2015, but yeah, why that change was introduced is a bit hazy as devs were manipulating the setTimeout/setIntermediate APIs to accomplish the same effect.

# Highest Priority




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# NextTick Queue 
  (nodejs/not in browser)
  (nextTick)



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# MacroTask Queue
  (execution, event callback)

• pop callstack for callback