Language Gotchas Practice

Language Gotchas Practice

Now that you've finished Pattern Recognition Drill, you can usually choose a reasonable algorithmic direction. The next interview risk is smaller but still real: language behavior that looks obvious until it is not.

Language gotchas show up as quick code-reading questions:

• "What does this print?"
• "Why is this condition not matching?"
• "Where should this filter go?"
• "Why did this query duplicate rows?"
• "What edge case breaks this?"

This lesson is a practice bridge into the Language And Frameworks section. We will use SQL-flavored examples because SQL makes several gotchas visible: NULL, filtering order, grouping, and joins.

Upcoming language-specific cheat sheets, starting with Python Interview Questions Cheat Sheet, will use the same habit: do not just memorize trivia; practice explaining behavior.