struct is not nil golang
Explanation of a Non-Nil Struct in Go
In Go, a struct is not nil by default, even if it is not explicitly initialized. When a struct is declared without any initialization, its fields are set to their respective zero values, but the struct itself is not nil. This behavior is different from some other languages where an uninitialized struct would be considered nil or null.
If you want to explicitly create a nil struct, you can use a pointer to the struct type. This means that the pointer will have a nil value until it is explicitly assigned to a struct instance using the address-of operator (&) or the new function.
Here's an example to illustrate this behavior:
package main
import "fmt"
type Person struct {
Name string
Age int
}
func main() {
var p1 Person
var p2 *Person
fmt.Println(p1) // Output: { 0}
fmt.Println(p2) // Output: <nil>
}
In the example above, p1
is a non-nil struct, while p2
is a pointer to a struct with a nil value. This demonstrates the difference between a non-nil struct and a nil pointer to a struct in Go.