ok.go

package main

import "fmt"
  
func change(a []int) {
   for i := 0; i < len(a); i++ {
      a[i] = 42
   }
}

func main() {
   numbers := []int{1,2,3}
   fmt.Println(numbers) // prints [1 2 3]
   change(numbers)
   fmt.Println(numbers) // prints [42 42 42]
}