How to return the last element?

Question

JavaScript

Hello. I'm solving algorithmic problems and I have a question.
Task:
Given a string, and it is necessary to find the most repeated character in it.
That is: "abcccss" => "c";
My implementation:

const maxChar = str => {
  const charObj = {};
  let max = 0;
  let maxChar = '';

  for (let char of str) {
    if (charObj[char]) {
      charObj[char]++;
    } else {
      charObj[char] = 1;
    }
  }

  for (let char in charObj) {
    if (charObj[char] > max) {
      max = charObj[char];
      maxChar = char;
    }
  }
  console.log(charObj);
  return maxChar;
};

maxChar('abccccsddasdadwqwf') => "c" // а должно "d"

But if the word has >2 repetitions. characters, then you need to return the last one, but for me it returns the first one. How to implement it?

Answer 1

Algorithmically, it is possible to calculate it in one pass of the loop

const maxChar = str => {
  const charObj = {};
  let max = {char:'', count:''};
  let maxChar = '';

  for (let char of str) {

    if (charObj[char]) {
      charObj[char]++;
    } else {
      charObj[char] = 1;
    }

    if ( charObj[char] >= max.count ) {
      max.char = char
      max.count = charObj[char]
    }

  }

  return max.char;
};

console.log( maxChar('abccccsddasdadwqwf'))