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  2. Composition over inheritance - Wikipedia

    en.wikipedia.org/wiki/Composition_over_inheritance

    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]

  3. Object-oriented programming - Wikipedia

    en.wikipedia.org/wiki/Object-oriented_programming

    Object-oriented programming ( OOP) is a programming paradigm based on the concept of objects, [ 1] which can contain data and code: data in the form of fields (often known as attributes or properties ), and code in the form of procedures (often known as methods ).

  4. Constructor (object-oriented programming) - Wikipedia

    en.wikipedia.org/wiki/Constructor_(object...

    In class-based, object-oriented programming, a constructor (abbreviation: ctor) is a special type of function called to create an object. It prepares the new object for use, often accepting arguments that the constructor uses to set required member variables . A constructor resembles an instance method, but it differs from a method in that it ...

  5. Class (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Class_(computer_programming)

    In the terms of type theory, a class is an implementation‍—‌a concrete data structure and collection of subroutines‍—‌while a type is an interface. Different (concrete) classes can produce objects of the same (abstract) type (depending on type system). For example, the type (interface) Stack might be implemented by SmallStack that ...

  6. Virtual inheritance - Wikipedia

    en.wikipedia.org/wiki/Virtual_inheritance

    Virtual inheritance is a C++ technique that ensures only one copy of a base class ' s member variables are inherited by grandchild derived classes. Without virtual inheritance, if two classes B and C inherit from a class A, and a class D inherits from both B and C, then D will contain two copies of A ' s member variables: one via B, and one via C.

  7. Comparison of programming languages (object-oriented programming)

    en.wikipedia.org/wiki/Comparison_of_programming...

    List of "Hello World" programs. Comparison of individual. languages. v. t. e. This comparison of programming languages compares how object-oriented programming languages such as C++, Java, Smalltalk, Object Pascal, Perl, Python, and others manipulate data structures .

  8. List of object-oriented programming languages - Wikipedia

    en.wikipedia.org/wiki/List_of_object-oriented...

    For example, C++ is a multi-paradigm language including object-oriented paradigm; [2] however, it is less object-oriented than some other languages such as Python [3] and Ruby. [4] Therefore, some people consider C++ an OOP language, while others do not or refer to it as a "semi-object-oriented programming language".

  9. Covariance and contravariance (computer science) - Wikipedia

    en.wikipedia.org/wiki/Covariance_and_contra...

    Within the type system of a programming language, a typing rule for a type constructor I is: covariant if it preserves the ordering of types (≤), which orders types from more specific to more generic: If A ≤ B, then I<A> ≤ I<B>; contravariant if it reverses this ordering: If A ≤ B, then I<B> ≤ I<A>;