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

export function mostUsedChar(text) {
  const total = text.split("");

  let repeat = {};
  total.forEach((count) => {
    repeat[count] = (repeat[count] || 0) + 1;
  });

  const maxVal = Math.max(...Object.values(repeat));
  const num = Object.keys(repeat).find((key) => repeat[key] === maxVal);
  return num;
}

console.log(mostUsedChar("fdgdfgff")); //("f")
console.log(mostUsedChar("Lorem ipsum")); //("m")
console.log(mostUsedChar("adsassdasd")); //("s")
console.log(mostUsedChar("testeeeee")); //("e")