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Object-oriented programming
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"Object-oriented" redirects here. For other meanings of object-oriented, see Object-orientation.
"Object-oriented programming language" redirects here. For a list of object-oriented programming languages, see List of object-oriented programming languages.
Programming paradigms
Action
Agent-oriented
Array-oriented
Automata-based
Concurrent computing
Relativistic programming
Data-driven
Declarative (contrast: Imperative)
Functional
Functional logic
Purely functional
Logic
Abductive logic
Answer set
Concurrent logic
Functional logic
Inductive logic
Constraint
Constraint logic
Concurrent constraint logic
Dataflow
Flow-based
Reactive
Functional reactive
Ontology
Differentiable
Dynamic/scripting
Event-driven
Function-level (contrast: Value-level)
Point-free style
Concatenative
Generic
Imperative (contrast: Declarative)
Procedural
Object-oriented
Polymorphic
Intentional
Language-oriented
Domain-specific
Literate
Natural-language programming
Metaprogramming
Automatic
Inductive programming
Reflective
Attribute-oriented
Macro
Template
Non-structured (contrast: Structured)
Array
Nondeterministic
Parallel computing
Process-oriented
Probabilistic
Quantum
Set-theoretic
Stack-based
Structured (contrast: Non-structured)
Block-structured
Structured concurrency
Object-oriented
Actor-based
Class-based
Concurrent
Prototype-based
By separation of concerns:
Aspect-oriented
Role-oriented
Subject-oriented
Recursive
Symbolic
Value-level (contrast: Function-level)
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Object-oriented programming (OOP) is a programming paradigm based on the concept of "objects", 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).

A feature of objects is that an object's own procedures can access and often modify the data fields of itself (objects have a notion of this or self). In OOP, computer programs are designed by making them out of objects that interact with one another.[1][2] OOP languages are diverse, but the most popular ones are class-based, meaning that objects are instances of classes, which also determine their types.

Many of the most widely used programming languages (such as C++, Java, Python, etc.) are multi-paradigm and they support object-oriented programming to a greater or lesser degree, typically in combination with imperative, procedural programming. Significant object-oriented languages include: Java, C++, C#, Python, R, PHP, Visual Basic.NET, JavaScript, Ruby, Perl, SIMSCRIPT, Object Pascal, Objective-C, Dart, Swift, Scala, Kotlin, Common Lisp, MATLAB, and Smalltalk.