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Daily: 2026-10-21 — Contains Duplicate - #8
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GAjay
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October 21, 2026 04:58
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Problem:
contains-duplicate—problems/2026-10-21-contains-duplicate/Approach: Walk the array once while tracking seen values in a
Set. If a number was already seen, returntrue; otherwise add it and continue. Returnfalsewhen the scan finishes with no repeats.Tests (passed):
node --test problems/2026-10-21-contains-duplicate/contains-duplicate.test.jsnpm run test:ci