W3School TIY Editor

package main import ("fmt") func main() { myslice1 := []int{1, 2, 3, 4, 5, 6} fmt.Printf("myslice1 = %v\n", myslice1) fmt.Printf("length = %d\n", len(myslice1)) fmt.Printf("capacity = %d\n", cap(myslice1)) myslice1 = append(myslice1, 20, 21) fmt.Printf("myslice1 = %v\n", myslice1) fmt.Printf("length = %d\n", len(myslice1)) fmt.Printf("capacity = %d\n", cap(myslice1)) }