Interfaces in Go enable polymorphism, allowing you to create generic types that can work with any type implementing those interfaces. However, unlike languages like Java or C , Go does not support multiple inheritance. This raises the question of how to achieve certain design patterns, such as using a type that "should implement" two interfaces, without inheritance.
To hide your struct type and represent it as an interface:
type Card interface { GetFace() string GetSuit() string }
You also want to define a String() method for your Card interface, but this presents a challenge as you cannot pass an interface to the String() method's implementation.
Instead of using the anti-pattern of hiding your struct and exporting only the interface, consider the following approach:
Hide your struct fields to prevent external modification, but export a pointer to it:
type Card struct { // ... struct fields here } func NewCard(...) *Card { // ... }
Define a String() method for the pointer to your Card struct:
func (c *Card) String() string { // ... }
This approach allows you to:
While the "interface hiding" pattern may seem appealing, it can lead to poor encapsulation, hurt documentation, and introduce unnecessary complexity. The recommended approach of exporting a pointer to the struct and implementing the String() method on the pointer type provides a cleaner and more effective solution.
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