Developer Refactors Habit Tracker Streak Logic Into a Single Reusable React Hook

A developer rebuilt the core streak-tracking logic of a habit tracker app into a single custom React hook called useStreak, sharing the approach on DEV Community. The hook handles common edge cases such as timezone differences and configurable daily reset times, using a resetHour parameter to accommodate users like night-shift workers whose days don't end at midnight. Wrapping the logic in a hook rather than a plain utility function improves composability, allowing it to be layered with other hooks like useNotificationSchedule or useMilestone without duplicating calculations across components. The isolated structure also makes the logic easier to unit-test independently of any UI. The developer also flagged a design consideration: displaying 'longest streak' alongside 'current streak' can help prevent users from feeling that one missed day erases all their progress.