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

export function mostUsedChar(text) {
  let count = 0,
    letter = "";
  text.split("").forEach(function (char) {
    if (text.split(char).length > count) {
      count = text.split(char).length;
      letter = char;
    }
  });
  return letter;
}