Question

How to remove odd frequency characters from a string in JavaScript

Answer 1

function removeOddFrequencyCharacters(s) { 
    const frequencyMap = new Map();
    const chArray = Array.from(s);
 
    // Count the frequency of each character
    for (const ch of chArray) {
        frequencyMap.set(ch, (frequencyMap.get(ch) || 0) + 1);
    }
 
    // Build the result string excluding characters with odd frequencies
    let result = '';
    for (const ch of chArray) {
        if (frequencyMap.get(ch) % 2 === 0) {
            result += ch;
        }
    }
 
    return result; 
} 
     
let s = "javascript programming version 15 ECMAScript 2024"; 

s = removeOddFrequencyCharacters(s);

console.log(s);

    
      
      
/*
run:
      
vscitogmmingvsioncit22
      
*/

 

70+ SQL courses for beginners and professionals