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Composition over inheritance (or composite reuse principle) in object-oriented programming (OOP) is the principle that classes should favor polymorphic behavior and code reuse by their composition (by containing instances of other classes that implement the desired functionality) over inheritance from a base or parent class. [2]
ECS follows the principle of composition over inheritance, meaning that every entity is defined not by a type hierarchy, but by the components that are associated with it. Systems act globally over all entities which have the required components.
Some languages like Go do not support inheritance at all. Go states that it is object-oriented, [35] and Bjarne Stroustrup, author of C++, has stated that it is possible to do OOP without inheritance. [36] The doctrine of composition over inheritance advocates implementing has-a relationships using composition instead of inheritance. For ...
Inheritance is contrasted with object composition, where one object contains another object (or objects of one class contain objects of another class); see composition over inheritance. In contrast to subtyping’s is-a relationship, composition implements a has-a relationship.
Composition over inheritance: "Favor 'object composition' over 'class inheritance'." (Gang of Four 1995:20) The authors claim the following as advantages of interfaces over implementation: clients remain unaware of the specific types of objects they use, as long as the object adheres to the interface
The statement links our thoughts to the idea of composition. I find the statement "An ECS follows the principle of composition over inheritance, meaning that every entity is defined not by a "type" clarifying, as it tries to explain ECS by relating to similar ideas, which I think is the purpose of the statement.
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In object-oriented programming, a composite is an object designed as a composition of one-or-more similar objects, all exhibiting similar functionality. This is known as a " has-a " relationship between objects. [ 4 ]