Mixin

A small reusable bundle of methods that can be added to unrelated classes.

What is Mixin?

A mixin is a small bundle of methods that can be added to many unrelated classes, like a "can be printed" or "can be saved" ability. Python and TypeScript use mixins directly; C# gets a similar effect with default interface methods.

class JsonMixin:
    def to_json(self):
        import json
        return json.dumps(self.__dict__)

class Recipe(JsonMixin):
    def __init__(self, title):
        self.title = title

Level: Journeyman · More OOP terms at this level

Updated September 27, 2026