34.Conversion between array and slice - Programming in GO
Conversion between array and slice
In Go, array is a fixed length of continuous memory with specified type, while slice is just a reference which points to an underlying array. Since they are different types, they can’t assign value each other directly. See the following example:
package main
import "fmt"
func main() {
s := []int{1, 2, 3}
var a [3]int
fmt.Println(copy(a, s))
} Because `copy` only accepts slice argument, we can use the `[:]` to create a slice from array. Check next code:
package main
import "fmt"
func main() {
s := []int{1, 2, 3}
var a [3]int
fmt.Println(copy(a[:2], s))
fmt.Println(a)
}
The running output is:
2
[1 2 0]
The above example is copying value from slice to array, and the opposite operation is similar:
package main
import "fmt"
func main() {
a := [...]int{1, 2, 3}
s := make([]int, 3)
fmt.Println(copy(s, a[:2]))
fmt.Println(s)
}
The execution result is:
2
[1 2 0]
References:
Arrays, slices (and strings): The mechanics of ‘append’.
