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works with tab navigators.",{"key":136,"text":152},"`navigate` always resets the whole stack. regardless of whether the target screen already exists on it.",{"key":139,"text":154},"There is no difference, they are aliases.",{"key":142,"text":156},"`navigate` reuses an existing screen if present.","`navigate` will go to an existing instance of the route already on the stack if there is one (or add it if not); `push` always pushes a brand new instance onto the stack, even if one already exists.",{"id":159,"topic":9,"difficulty":129,"body":160,"options":161,"correct_key":133,"explanation":170},"019fa9e5-7202-7452-a4b4-a92327cf9b39","Which React Navigation hook lets a screen component know whether it is currently the focused (visible) screen?",[162,164,166,168],{"key":133,"text":163},"`useIsFocused()`",{"key":136,"text":165},"`useActiveScreen()`",{"key":139,"text":167},"`useVisibility()`",{"key":142,"text":169},"`useScreenState()`","`useIsFocused()` returns a boolean that updates whenever the screen's focus state changes, letting you conditionally render or run logic only while visible.",{"id":172,"topic":9,"difficulty":129,"body":173,"options":174,"correct_key":139,"explanation":183},"019fa9e5-7203-720e-a377-110fc88a6113","Why does a screen component NOT unmount when the user navigates away from it to another screen on the same stack?",[175,177,179,181],{"key":133,"text":176},"React Navigation always unmounts every screen on blur.",{"key":136,"text":178},"It only unmounts on Android, not iOS.",{"key":139,"text":180},"The stack keeps prior screens mounted underneath so back navigation is instant.",{"key":142,"text":182},"Unmounting is controlled entirely by Redux.","By default a stack navigator keeps previously visited screens mounted (just visually behind the new one) so that going back doesn't require re-mounting and re-fetching everything — the screen loses focus, it doesn't 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