Building a Simple Digital Clock App

Key Patterns & Techniques

• Use setInterval(fn, 1000) for real-time updates
• Use String.padStart(2, '0') for consistent time formatting
• Use toLocaleDateString for localized date display

Code Reference

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Common Pitfalls

• ⚠️ Forgetting to call the update function once before setInterval starts
• ⚠️ Missing font-variant-numeric: tabular-nums causing layout jitter