return the first non repeating character in a string in javascript

Question

So I tried looking for this in the search but the closest I could come is a similar answer in several different languages, I would like to use Javascript to do it.

T

Answer 1

    //To find first non repeating letter 
    //It will check for both upper and lower case
    //only use one String.indexOf()

    var mystr="ohvhvtccggt";
    var checkFirstNonRepeating=function(){
    var ele=[];
      for(var i=0;i