challenge-algorithms-v2.0/09-mostRepeatedChar/index.js

export function mostUsedChar(str) {
    const charMap = {};
    let max = 0;
    let mostUsedChar = '';
  
    // create character map
    for (let char of str) {
      if (charMap[char]) {
        // increment the character's value if the character existed in the map
        charMap[char]++;
      } else {
        // Otherwise, the value of the character will be increamented by 1
        charMap[char] = 1;
      }
    }
  
    // find the most commonly used character
    for (let char in charMap) {
      if (charMap[char] > max) {
        max = charMap[char];
        mostUsedChar = char;
      }
    }
  
    return mostUsedChar;
  }

  console.log(mostUsedChar("fdgdfgff"));
  
  console.log(mostUsedChar("Lorem ipsum"));
  
  console.log(mostUsedChar("adsassdasd"));
  
  console.log(mostUsedChar("testeeeee"));