Vue · Senior · Question 52 of 75

What does `deep: 2` on a watcher do (Vue 3.5+)?

✓Correct answer: Tracks nested changes only up to two levels deep
2Runs the callback twice
3Delays the callback by two ticks

Explanation

Deep watching of huge objects traverses everything on each change. Limiting depth reduces that cost.

Further reading

Vue: Watchers ↗

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