Find the Difference

Find the Difference.go

func findTheDifference(s string, t string) byte {
    var ans int32
    ans = 0
    for _, cs := range s {
        ans ^= cs
    }
    for _, ct := range t {
        ans ^= ct 
    }
    return byte(ans)
}


func findTheDifference(s string, t string) byte {
    //var r byte
    /*
    countS := make(map[byte]int, 0)  
    for _, v := range []byte(s){
        countS[v]++  
    } 
    
    countT := make(map[byte]int, 0)  
    for _, v := range []byte(t){ 
        countT[v]++  
    }
    
    for k,v := range countT {
        _, ok := countS[k]
        if !ok {
            return k
        }
        if v != countS[k]{
            return k
        }
    }
    return r
    */
    
    u := []byte(s + t)
    d := 0
    for _,v := range u {
        d ^= int(v)
    }
    
    return byte(d)
    
}