create function returns the first character that is not repeated anywhere in the string. Alaa-Khattab

firstNonRepeatingLetter.js

const firstNonRepeatingLetter = (input)=>{
  var inputChar = input.split('');
  var result = ""
  for(x = 0 ; x < inputChar.length ; x++){
    var newChar = input.toLowerCase().split('')
      newChar.splice(x,1)
    if(!newChar.includes(inputChar[x].toLowerCase())){
      result = inputChar[x];
      break;
    }
  }
  return result;
}
firstNonRepeatingLetter("sTreSS");