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  1. const findDuplicate = (str) => {
  2.   const chars = str.trim().replace(" ", "").split("");
  3.   const count = {};
  4.  
  5.   for (let char of chars) {
  6.     const normalized = char.toLowerCase();
  7.  
  8.     count[normalized] = (count[normalized] || 0) + 1;
  9.   }
  10.  
  11.   const isDuplicate = Object.values(count).some((c) => c === 2);
  12.  
  13.   return isDuplicate ? str : null;
  14. };
Success #stdin #stdout 0.05s 18708KB
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asdf
fdas
asds
d fm
dfaa
aaaa
aabb
aaabb
stdout
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Standard output is empty
https://ideone.com/BcB8HR
Можна ще було звісно зробити з Map або reduce, але вибрав саме зрозуміле та читабельне рішення.
language:
JavaScript (SMonkey 60.2.3)
created:
7 days ago
visibility:
public

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