The key difference is that JavaScript uses prototype-based inheritance, whereas conventional class-based languages such as Java and C++ use classes as the primary mechanism for inheritance. In a typical class-based language, a class defines the structure and behavior of objects, and another class inherits from it. JavaScript also supports the class keyword, but under the hood, its inheritance mechanism is still prototype-based.
Classical inheritance is based on a strict class hierarchy with clear parent-child relationships. Prototypal inheritance is more flexible and allows for more dynamic and ad-hoc object relationships.
Classical inheritance involves creating instances of predefined classes. Prototypal inheritance involves cloning or extending existing objects to create new objects.
Classical inheritance can be less flexible due to the rigid class hierarchy and compilation-time definitions. Prototypal inheritance offers greater flexibility and adaptability, allowing objects to be easily modified and extended at runtime.
In conventional inheritance, changing a base class can break an entire hierarchy because the structure is so rigid. In JavaScript, because it is Delegation-based, you can swap prototypes or augment them dynamically, making the code more 'composed' and flexible.
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