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Code Review

Swipe left if the code has a bug, right if it looks good.

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Code Review

Read the code. Swipe left (or ←) for a bug, right (or →) if it looks good. 3 lives.

About this game

Code Review shows short pieces of real JavaScript, TypeScript, React, CSS and SQL. Decide fast: is there a bug, or is it fine? Swipe left for a bug and right for good code, like a dating app for pull requests.

Every answer shows the bug line and a one-line explanation, and the end screen lists the cards you missed, so each round teaches a few classic mistakes: == vs ===, missing await, mutating React state, SQL injection and more.