Rotated Digits

Rotated Digits.go

func rotatedDigits(N int) int {
    count := 0 
    for i :=2; i <= N; i++ {
        if isValid(i) {
            count++
        }
    }
    return count
}

func isValid(n int)bool {
    var hasValid bool
    for n > 0 {
        switch n %10 {
            case 2, 5, 6, 9:
                hasValid = true
            case 3, 4,7 :
                return false
        }
        n /= 10
    }
    return hasValid
}