Mida tähistab teise argument funktsioonis ZeroValue tagastamisel teatud programmeerimiskeeltes?

In many programming languages, including Go, a function can return multiple values, such as the result and an error.

In the context of Go, when a function returns ZeroValue (the zero value of the type) as the first argument, the second argument is often used to convey information about the error or execution status.

For example, a function might have the following signature:

func GetUser(id int) (User, error)

If the user is not found, the function will return User{} — the zero value of the User struct — and an error describing the problem:

return User{}, errors.New("user not found")

Thus, the second argument serves to pass additional information about the result of the operation, usually an error, allowing the calling code to handle the situation correctly.