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Lessons (5)

• Comments & Formatting

  Good code explains WHAT and HOW by itself; comments should explain WHY. Plus the formatting habits that make …

• Frontend Security

  … posts a comment hiding an img tag with an onerror script V- S: opens the page S-- V …

• Meaningful Names

  … Use deleteAllRecords() . Key takeaways - A good name removes the need for a comment. - Nouns for things, verbs for …

• Design a Social Media Feed

  … Keep likes/comments as separate scalable counters or event streams. It is acceptable for a new post to …

• Code Smells & Refactoring

  … Fix (refactoring) --- --- --- --- 1 Long function 80+ lines, many comments splitting sections Extract Function 2 Large class UserManager with …