First Unique Character in a String

FirstUniqueCharacterinaString.go

func firstUniqChar(s string) int {  //it is fast
	m := [26]int{}
	for _, ch := range s {
		m[int(ch-'a')]++
	}
	for k, ch := range s {
		if m[int(ch-'a')] == 1 {
			return k
		}
	}
	return -1
}
//--------------------------------------
func firstUniqChar(s string) int {  //it is slow
  temp := make(map[int32]int)
  
  for _, v := range s {
        temp[v]++ 
    }
    
  for  k, v := range s{
        if temp[v] == 1 {
            return   k       
        }
    }
    return  -1
}