Have you ever wondered why some pieces of JavaScript code seem to run out of order? The key to understanding this is the event loop.
JavaScript's ...
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Thank you for your feedback, Daniel 😁
Why in the last examples, the fallback setTimeOut executed first?
The reason the "fallback setTimeout" (i.e.,
Step 6: Immediate (using setTimeout with 0 delay as fallback)) is executed beforeStep 5: Timeout 2has to do with when each setTimeout is added to the macrotask queue (scheduled).Since
Step 5: Timeout 2was inside a setTimeout (a macrotask) and was called within a promise (a microtask), it experienced a delay before being scheduled. Meanwhile,Step 6: Immediate (using setTimeout with 0 delay as fallback)was called outside of a promise and was scheduled immediately.What this means is that the second setTimeout (Step 5) was delayed, while the first setTimeout (Step 6) was processed right away.
I hope this explanation clarifies things better!
For Macro tasks, in the definition, it's mentioned that they are executed before next event loop but in the comparison table it's mentioned executed in the next event loop! Which one is correct?