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  1. function checkNumberOfLetters(str) {
  2.   const splitedStr = str.trim().split('');
  3.  
  4.   const charCout = splitedStr.reduce((acc, curr) => {
  5.     acc[curr] = (acc[curr] || 0) + 1;
  6.  
  7.     return acc;
  8.   }, {});
  9.  
  10.   for (const [key, value] of Object.entries(charCout)) {
  11.     if (value === 2) {
  12.       return str;
  13.     }
  14.   }
  15.  
  16.   return null;
  17. }
Success #stdin #stdout 0.03s 16488KB
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https://ideone.com/ylRHss
language:
JavaScript (SMonkey 60.2.3)
created:
4 days ago
visibility:
public

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