Question

How to find all repeating characters in a string with Node.js

Answer 1

function GetAllRepeatingCharacters(str) {
 	const repeating = {};
 	
    for (const ch of str) {
        repeating[ch] = (repeating[ch] || 0) + 1;
    }
    
    return Object.entries(repeating).filter(ch => ch[1] > 1).map(ch => ch[0]);
}

const s = "java c c++ csharp node.js php python";

console.log(GetAllRepeatingCharacters(s)); 

  
  
  
  
/*
run:
  
[
  'j', 'a', ' ', 'c',
  '+', 's', 'h', 'p',
  'n', 'o'
]
  
*/

 

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