package builtin
The cap built-in function returns the capacity of the input vector, according to the vector type:
Golang builtin.cap() function usage example
package main
import "fmt"
func main() {
array := []int{1,2,3,4,5,6,7,8,9,10}
fmt.Println(array[:]) // print everything
fmt.Println(array[0:5]) // print element 0 to 5. Remember, array starts counting from zero!
// there are times we do not know the size of the array during runtime
// so use cap() function
fmt.Println(array[:cap(array)]) // cap() returns the capacity/max size of the array
}
Output :
[1 2 3 4 5 6 7 8 9 10]
[1 2 3 4 5]
[1 2 3 4 5 6 7 8 9 10]
Reference :
http://golang.org/pkg/builtin/#cap
