Explain identity tracking and the empty block.
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Why does @for require track and how does @empty improve UX?
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control-flowtrackperformance
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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.
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Study the solution
track tells Angular how to identity items for minimal DOM moves; @empty replaces manual empty checks.
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Dossier 74 of 121 decoded in the Angular track. One more won't hurt.