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Run, debug, and submit 131 curated problems in Python and TypeScript—right on your computer. Byte, your private local AI copilot, celebrates the clean code and calls out the chaos.

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LocalQuestLVL 7
MISSION 01 · EASY

Contains Duplicate

Return true if any value appears at least twice.

1export function containsDuplicate(nums) {
2  const seen = new Set();
3  for (const n of nums) {
4   if (seen.has(n)) return true;
5   seen.add(n);
6  }
7  return false;
8}
OUTPUT✓ 4 tests passed
131curated problems
2languages
100%local execution
0code sent to the cloud
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