Can an element be added to a slice that has not been created or initialized yet?

In Go, a slice is a structure that contains a pointer to an array, a length, and a capacity. If the slice is uninitialized (i.e., nil), you can add elements directly using append — the append function will create a new array and return a new slice with the added element.

Example:

var s []int // nil slice
s = append(s, 10) // append works even with a nil slice
fmt.Println(s) // [10]

Thus, you can add an element to a slice even if it has not been created or initialized yet, thanks to the features of append.