the array in golang is value type. In my understanding, value type save the value, but not a memory address. So the following code, variable arr shouldn't be changed. but it no. I want know why

func main() {
    arr := []int{0,0,0}
    arr2 := arr

    arr[1] = 1

    fmt.Println(arr, arr2)
    // output [0 1 0] [0 1 0]
    // output in thought [0 0 0] [0 1 0]
}

maybe this is a basic question. But I found some article. they all just said which are reference types and value types in golang. But it couldn't help me to solve my problem.

CodePudding user response：

You are using a slice, not an array. In your program, both arr and arr2 are slices pointing to the same array. Change it so that:

    arr := [3]int{0,0,0}

Then, arr is an array, and it works as you expect.