So you think you know Go?

Golang pretend to be very simple and beginners friendly programming language. If you think so, try to guess the output of four small programs. And maybe you’ll be very surprised with results :)

Here also links to Go playground to check out the actual output.

Quiz #1: https://play.golang.org/p/WGPJeHqtv1j

package main
import "fmt"
func surprise(a []int) {
    for i := range(a) {
        a[i] = 5
    }
    fmt.Println(a)
}
// Quiz #1
func main() {
    a := []int{1, 2, 3, 4}
    surprise(a)
    fmt.Println(a)
}

Quiz #2: https://play.golang.org/p/w7nAvEMdjIt

package main
import "fmt"
func surprise(a []int) {
    a = append(a, 5)
    for i := range(a) {
        a[i] = 5
    }
    fmt.Println(a)
}
// Quiz #2
func main() {
    a := []int{1, 2, 3, 4}
    surprise(a)
    fmt.Println(a)
}

Quiz #3: https://play.golang.org/p/F5vqKP87PeR

package main
import "fmt"
func surprise(a []int) {
    a = append(a, 5)
    for i := range(a) {
        a[i] = 5
    }
    fmt.Println(a)
}
// Quiz #3
func main() {
    a := []int{1, 2, 3, 4}
    surprise(a)
    a = append(a, 5)
    fmt.Println(a)
}

Quiz #4: https://play.golang.org/p/UHClB-dI1YK

package main
import "fmt"
func surprise(a []int) {
    a = append(a, 5)
    for i := range(a) {
        a[i] = 5
    }
    fmt.Println(a)
}
// Quiz #4
func main() {
    a := []int{1, 2, 3, 4}
    a = append(a, 5)
    surprise(a)
    fmt.Println(a)
}

Gave the correct answers to all quizes? Maybe confused with some of them? Please share your results :)