Problem Solving & Design 83

The solution directly addresses the brief with a coherent single-screen layout, though responsive behavior is incomplete.

• +The interface follows a logical flow: name the exercise, tap to count, finish the set, view history
• +Rep count updates instantly on tap, meeting the core interaction requirement
• +History list is visible below the counter, keeping past and present work in view
• +Interaction states and motion are considered throughout, reinforcing the feedback loop
• -Layout adaptation to screen size is only partial, which may compromise usability on smaller devices
• -Semantic document structure is incomplete in parts, potentially affecting how the interface is understood by assistive technology

Completeness 79

All core features are present and wired, though the rep-count animation is only partially implemented.

• +Exercise naming, rep counting, set logging, and history persistence all work end-to-end
• +History entries display exercise name, rep count, and timestamp as specified
• +Reset and delete operations are both available and functional
• +Input validation is applied throughout the build
• -The rep-count animation feedback is partial rather than fully satisfying—the scale bounce in counter.css exists but may not deliver the intended impact
• -No automated tests exist to verify that the core logging and persistence flows work as intended

Technical Craft 81

Code is well-modularized with explicit types and named functions, but lacks test coverage and error surfacing.

• +Components are separated into focused modules (ExerciseNameInput, RepButton, SetControls, HistoryList, HistoryRow)
• +Type definitions are explicit across most of the build, including a dedicated types.ts file
• +Logic is extracted into named functions and custom hooks (useSetDraft, useSetLog)
• +Storage operations in lib/storage.ts handle the risky work of persisting to localStorage
• -No automated tests exist to catch regressions in the logging, reset, or deletion flows
• -Failure handling around risky operations is only partial, and errors are not surfaced to the user when they occur