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The Tragic Death of Inheritance (avivcarmi.com)

submitted 1 year ago by snaggen to c/programming

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[–] [email protected] 4 points 1 year ago (2 children)

You're not describing composition.

Go Files do not "hasa reader". You don't do file.reader.read(), you just do file.read(), that's inheritance as file has inherited the read() method.

[–] [email protected] 8 points 1 year ago

You're confusing polymorphism for inheritance. read is a method on an interface that File implements - it is not inherited from a base class. You can use that File directly, or wherever a Reader interface (or whatever the name is, idk I don't really do Go) is expected.

[–] [email protected] 4 points 1 year ago (1 children)

Composition do not necessitate the creation of a new field like x.reader or x.writer, what are you on?

[–] [email protected] 0 points 1 year ago (1 children)

https://www.infoworld.com/article/3409071/java-challenger-7-debugging-java-inheritance.html#toc-2

composition is literally the "has a" relationship. That's how its always been taught.

[–] [email protected] 1 points 1 year ago* (last edited 1 year ago)

Man, I honestly have no idea why they are downvoting you. Composition literally means taking common behavior and placing it in external objects behind interfaces using a has-a relationship.

No idea why they are denying this. Inheritance vs composition is the same as "is-a" vs "has-a". In composition re usability isn't done via inheritance but code encapsulation.

Saying that in Go objects can implement many interfaces is the Interface Segregation principle from SOLID. Basically having small interfaces instead of a big interface with methods that may not be implemented by all implementors.