Why Bug Diagnosis Matters

Great developers don’t just fix bugs they understand them. Diagnosing issues without running code helps you think clearly, save time, and avoid trial-and-error debugging.

Train Your Debugging Mindset

This quiz challenges you to reason through realistic bug scenarios. You’ll practice identifying likely causes and sharpen your logical thinking.

A function always returns the same value, no matter the input. What is the most likely cause?

A loop runs forever and never ends. What should you check first?

A value is always null when accessed later. What is a common reason?

A feature works only after refreshing the page. What is the likely issue?

An error appears only when many users are active. What should you suspect first?

A calculation gives incorrect results only for large numbers. What is a common cause?

An API works locally but fails in production. What should you examine first?

A bug disappears when debug logs are added. What might this indicate?

A fix causes new bugs in unrelated areas. What is the most likely reason?

Before running code, what habit best helps diagnose bugs accurately?

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