Unraveling the Mystery: What Does Method Mean in Object-Oriented Programming?

Object-oriented programming (OOP) has become the industry standard for software development, offering a more efficient and intuitive approach to designing applications. At the core of this paradigm are methods, which define the behavior of objects within the system. In this glossary page, we will dive into the concept of method in OOP, how it works, its benefits, best practices, use cases, and some recommended books to guide developers in this subject.

“Object-oriented programming is an exceptionally bad idea which could only have originated in California.” – Edsger W. Dijkstra

What is a method in OOP? Definition of Member Function (Programming)

A method in OOP is a function or procedure associated with a specific class or an object, which performs an action or a set of actions using the properties of that object. Simply put, methods are the means by which objects interact with one another, allowing the programmer to control the behavior and interaction between different components of the system. Methods are essential to maintain the principles of OOP, such as encapsulation, inheritance, and polymorphism.

ℹ️ Synonyms: Approach, technique, procedure, way, system, fashion.

How it Works

In OOP, a method is always associated with an object or a class, and cannot be called independently. When a method is called, the object that the method is associated with is implicitly passed to the method as an argument. This object, often referred to as “self” or “this,” allows the method to access and manipulate the properties and other methods of the object.

To demonstrate this concept, consider a simple example of a BankAccount class with a balance property and a deposit method:

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class BankAccount:
def __init__(self, initial_balance):
self.balance = initial_balance

def deposit(self, amount):
self.balance += amount

In this example, deposit is a method of the BankAccount class. When we call this method on an instance of BankAccount, it will update the balance of that specific instance. The updated balance can then be accessed using the balance property of the object.

Benefits of using method in OOP

  • Encapsulation: Methods allow developers to bundle together data (properties) and the behavior that acts upon that data. This makes it easier to understand and maintain the code, as well as protecting the data from being accidentally modified from external sources.
  • Code Reusability: Methods enable reusing code across multiple objects, minimizing the need to write the same code multiple times. This not only simplifies the code but also reduces the chances of errors and inconsistencies.
  • Maintainability: By utilizing methods, developers can break the code into smaller, modular units, making it easier to update, debug, and extend the functionality of the application.
  • Abstraction: Methods provide an interface to interact with objects, hiding the underlying complexity of the data and the way it is represented. This abstraction allows developers to focus on the functionality and behavior of an object without worrying about the internal details.
  • Polymorphism: Methods enable objects of different classes to be treated as objects of a common superclass, allowing for code that is more flexible and easier to extend. This polymorphism helps in creating more versatile applications.

Method in OOP use cases

Methods in OOP are used in a wide range of applications, from simple data manipulation tasks to complex business logic implementations:

  • Performing calculations, such as the area of a shape or the interest accrued on a bank account.
  • Manipulating and formatting data, such as converting temperature units or formatting a string.
  • Interacting with external systems, such as databases, APIs, or file systems.
  • Implementing business logic, such as validating user input or managing a shopping cart in an e-commerce platform.
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Best Practices

When implementing methods in OOP, it is important to follow a few best practices to ensure maintainable, reusable, and efficient code:

Each method should be focused on a single task, following the Single Responsibility Principle. This makes the method easier to understand, test, and reuse. Also, choose appropriate method names that clearly convey the purpose and functionality of the method. Be consistent in the naming convention for better readability.

Keep methods simple and limit their complexity, especially when it comes to the number of parameters they accept. This makes them much more readable and easier to refactor as needed. Additionally, consider using access modifiers (public, private, and protected) to control the visibility and scope of methods and properties, ensuring encapsulation and proper access control.

Most recommended books about method in OOP

To gain a deeper understanding of method in OOP, consider reading the following books:

  • “Object-Oriented Programming: An Evolutionary Approach” by Brad J. Cox and Andrew J. Novobilski
  • “Design Patterns: Elements of Reusable Object-Oriented Software” by Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides
  • “Clean Code: A Handbook of Agile Software Craftsmanship” by Robert C. Martin
  • “Head First Design Patterns” by Eric Freeman, Elisabeth Robson, Kathy Sierra, and Bert Bates
  • “The Art of Computer Programming” by Donald E. Knuth


Method in OOP is a fundamental concept that enables developers to create well-structured, maintainable, and reusable code. Understanding the purpose, benefits, and best practices related to methods in OOP is essential for any software developer striving to create effective, high-quality software systems. By following the advice and recommendations outlined in this glossary, you’ll be well on your way to mastering this crucial aspect of object-oriented programming.

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Back in 2013, I founded Echo with the simple business idea: "Connect great tech companies around the globe with the brightest software engineers in Eastern Europe." We've employed hundreds of talents so far and keep going.
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li-url Lou Reverchuk

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