Debug Build Hunt ∞Spot the Bug DSA Learn 3D Lab Progress

Build: Game Leaderboard

MediumNode · Express · Jest

00:00 / 30:00

Spec

Implement Leaderboard in lib/leaderboard.js. Ranking rules are in the doc comment.

This exercises the details interviewers love: multi-key comparators, tie handling (1, 1, 3, 4), and boundary-safe slicing.

Concepts

comparatorsrankingslicingdata modelling

Workflow that wins the OA: run the tests → read the first failure → open the file it points to → form one hypothesis → change one thing → rerun. Use the Request flow tab to see exactly which middleware/handler/DB calls ran.

Explorer

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tests

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