Golang : Convert slice to array

For new comer to Golang, slice and array can be confusing sometimes. In a nutshell, a slice length(size) is flexible and array length(size) is not. Since they are different, many assume that by using the = operator, a new array will be populated with the elements from a slice.

To convert a slice to array properly, use the builtin copy() function.

For example :

 package main

 import "fmt"

 func main() {

  slice := []byte("abcd1234")

  var arr [8]byte

  copy(arr[:], slice[:8])
  
  fmt.Println(arr) 

  fmt.Println(string(arr[:])) // []byte to string

 }

Sample output :

[97 98 99 100 49 50 51 52]

abcd1234