fixCase.js

/* In this Kata, you will be given a string that may have mixed uppercase and lowercase letters and your task is to convert that string to either lowercase only or uppercase only based on:

make as few changes as possible.
if the string contains equal number of uppercase and lowercase letters, convert the string to lowercase.
For example:

solve("coDe") = "code". Lowercase characters > uppercase. Change only the "D" to lowercase.
solve("CODe") = "CODE". Uppercase characters > lowecase. Change only the "e" to uppercase.
solve("coDE") = "code". Upper == lowercase. Change all to lowercase. */

function solve(s){
    let lowerC = 0;
    let upperC = 0;
    for( let i = 0;i<s.length;i++){
      if( s[i] == s[i].toUpperCase()){
        upperC++;
      }
      else{
        lowerC++;
      }
    }
    return lowerC >= upperC ? s.toLowerCase() : s.toUpperCase()
}