Javascript:
function nextHappyYear(year) { const nextYear = ~~year + 1; const isHappyYear = new Set(`${nextYear}`).size === `${year}`.length; if (!isHappyYear) { return nextHappyYear(nextYear); } return nextYear; }
Results:
nextHappyYear(2018); // 2019 nextHappyYear(1001); // 1023 nextHappyYear(7712); // 7801
Clever usage of Set!
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Javascript:
Results:
Clever usage of Set!