How to Copy an Array in Go - Step by Step Examples

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How to Copy an Array in Go ?

Answer

To copy an array in Go, you can use the copy() function or create a new array and copy the elements manually.

✐ Examples

1 Copying an Array using copy() Function

In this example,

We create an array named arr1 with elements.
We then use copy(arr2, arr1) to copy the elements of arr1 into arr2.
copy() function copies elements from one slice to another and returns the number of elements copied.

Go Program

package main
import "fmt"
func main() {
    arr1 := []int{1, 2, 3, 4, 5}
    arr2 := make([]int, len(arr1))
    copy(arr2, arr1)
    fmt.Println("Array 1:", arr1)
    fmt.Println("Array 2 (copy of Array 1):", arr2)
}

Output

Array 1: [1 2 3 4 5]
Array 2 (copy of Array 1): [1 2 3 4 5]

2 Copying an Array Manually

In this example,

We create an array named arr1 with elements.
We then create a new array arr2 with the same length as arr1.
We use a loop to copy each element from arr1 to arr2 individually.

Go Program

package main
import "fmt"
func main() {
    arr1 := []int{1, 2, 3, 4, 5}
    arr2 := make([]int, len(arr1))
    for i := range arr1 {
        arr2[i] = arr1[i]
    }
    fmt.Println("Array 1:", arr1)
    fmt.Println("Array 2 (copy of Array 1):", arr2)
}

Output

Array 1: [1 2 3 4 5]
Array 2 (copy of Array 1): [1 2 3 4 5]

Summary

In this tutorial, we learned How to Copy an Array in Go language with well detailed examples.

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