In go language everything is pass by value even slice. but in slice case slice header pass by value so both headers point to the same back array

slice_pass_by_ref.go

package main

import "fmt"

func main() {
	a := []byte{'A', 'M', 'N', 'J', 'E', 'E', 'T'}
	b := s(a)
	b[0], b[1] = b[1], b[0]
	fmt.Println(string(a))

}

func s(ints []byte) []byte {
	return ints
}