I have the following code to double the slice.
func doubleSlice(s []int) []int {
t := make([]int, len(s), (cap(s) + 1) * 2 )
for i := range s {
t[i] = s[i]
}
return t
}
I want to make the func to double any type of slice. And I need to know the element type first.
func showInterfaceItem(s interface{}) interface{} {
if reflect.TypeOf(s).Kind() != reflect.Slice {
fmt.Println("The interface is not a slice.")
return
}
var t interface{}
newLen := reflect.ValueOf(s).Len()
newCap := (cap(reflect.ValueOf(s).Cap()) + 1) * 2
t = make([]reflect.TypeOf(s), newLen, newCap)
return t
}
The reflect.TypeOf(s)
return the type of interface{}, not the type of element. How can I get the element type of slice interface?