Example
Struct fields whose names begin with an uppercase letter are exported. All other names are unexported.
type Account struct {
UserID int // exported
accessToken string // unexported
}
Unexported fields can only be accessed by code within the same package. As such, if you are ever accessing a field from a different package, its name needs to start with an uppercase letter.
package main
import "bank"
func main() {
var x = &bank.Account{
UserID: 1, // this works fine
accessToken: "one", // this does not work, since accessToken is unexported
}
}
However, from within the bank package, you can access both UserId and accessToken without issue.
The package bank could be implemented like this:
package bank
type Account struct {
UserID int
accessToken string
}
func ProcessUser(u *Account) {
u.accessToken = doSomething(u) // ProcessUser() can access u.accessToken because
// it's defined in the same package
}
