The zero value of a slice is nil.

A nil slice has a length and capacity of 0.

(To learn more about slices, read the Slices: usage and internalsarticle.)

package main import "fmt"func main() {    var z []int    fmt.Println(z, len(z), cap(z))    if z == nil {        fmt.Println("nil!")    }}

A Tour of Go Nil slices