Different methods of copying an array using Golang

Example for copying an Array by value: 

package main
import "fmt"
func main() {
	// declare an array
	arr1 := [2]int{1, 2}
	// copying the array by value
	arr2 := arr1
	// change the 1st index value of the original declared array, it won't reflect on copyed array
	arr1[0] = 10
	fmt.Println("Array 1 values :", arr1)
	fmt.Println("Array 2 values :", arr2)
}

Output: 

Array 1 values : [10 2]
Array 2 values : [1 2]

Copying an array by reference:

package main
import "fmt"
func main() {
	// declare an array
	arr1 := [2]int{1, 2}
	// copying the array value by references
	arr2 := &arr1
	// change the 1st index value of the original declared array, it will reflect on copyed array 
	// because the arr2 holds value of arr1 address
	arr1[0] = 10
	fmt.Println("Array 1 values :", arr1)
	fmt.Println("Array 2 values :", *arr2)
}

Output: 

Array 1 values : [10 2]
Array 2 values : [10 2]

Using Copy function:

package main
import "fmt"
func main() {
	arr1 := []int{1, 2}
	arr2 := make([]int, len(arr1))
	copy(arr2, arr1)
	fmt.Println("Array 1 values :", arr1)
	fmt.Println("Array 2 values :", arr2)
}

Output: 

Array 1 values : [1 2]
Array 2 values : [1 2]

Using append function:

package main
import "fmt"
func main() {
	arr1 := []int{1, 2}
	arr2 := make([]int, 0, len(arr1))
	arr2 = append(arr2, arr1...)
	fmt.Println("Array 1 values :", arr1)
	fmt.Println("Array 2 values :", arr2)
}

Output: 

Array 1 values : [1 2]
Array 2 values : [1 2]