What is the length of a nil slice in Go?

In Go, the length of a nil slice is 0. A nil slice is a slice that does not point to any array and has the value nil. The functions len() and cap() for a nil slice return 0.

Example:

var s []int // s == nil
fmt.Println(len(s)) // 0
fmt.Println(cap(s)) // 0

Thus, a nil slice behaves like an empty slice with length 0.