Class Inheritance with `extends`: Pitfalls

Pitfalls and red flags

• Using inheritance for has-a relationships and creating brittle deep hierarchies.

• Forgetting super.new in a derived constructor and leaving inherited fields uninitialized.

• Putting protocol-specific behavior in a generic base class, which breaks reuse.

• Expecting multiple inheritance and trying to emulate it with copy-paste base code.

Related topics

• Back to Class Inheritance with `extends`