Compare watch and watchEffect.
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What is the difference between watch and watchEffect?
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01
Understand the problem
watchwatcheffect
02
Attempt it yourself
Sketch your approach before reading the solution — that's what interviews test.
Nudge consolestandby
Stuck? Beam a request up — the console returns a conceptual nudge that guides your logic without spoiling the implementation.
03
Study the solution
watch observes specific sources and gives you old and new values, running lazily (only on change). watchEffect runs immediately and re-runs whenever any reactive dependency it reads changes, auto-tracking them — handy but less explicit about what triggers it.
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