How-to articles, tricks, and solutions about OOP

In PHP, anonymous objects can be created using the new class syntax.

In Python, a method is a function that is associated with a class.

There are many examples of the GoF (Gang of Four) design patterns in the core libraries of Java. Here are some examples:

In PHP, you can use the $ operator to access an object's properties by name.

An interface is a collection of abstract methods that define a set of functions that a class must implement.

An interface defines a set of methods that a class must implement, but does not provide any implementation for those methods.

In Python, @classmethod is a decorator that is used to define a method as a class method.

In PHP, multiple inheritance is not supported in the traditional sense, where a class can inherit from multiple classes.

In PHP 7, type hinting can be used to specify the expected data type of a function or method parameter.

The super() function is a way to refer to the parent class and its attributes.

This error message is indicating that there is an unexpected use of the keyword "use" in your code when trying to run Composer.

__slots__ is a way to specify a fixed set of attributes for a class, which can help to save memory in certain situations.

Using $this inside a static function is not allowed in PHP because the $this variable is only available within the context of a non-static method.

In Python, a metaclass is a class that defines the behavior of a class. When you create a class, Python automatically creates a metaclass for you behind the scenes. You can think of a metaclass as a blueprint for creating a class.

In Python, type() is a built-in function that returns the type of an object, while isinstance() is a function that checks whether an object is an instance of a particular class or of a subclass thereof.

__init__ is a special method in Python classes, also known as a constructor.

In a class, the static keyword is used to declare a static member, which belongs to the class itself rather than an instance of the class. This means that you can access a static member without creating an instance of the class.

A mixin in Python is a class that is used to add specific functionality to other classes without inheriting from them.

In Python, classes can be divided into two types: old-style and new-style.

In PHP, public, private, and protected are access modifiers that control the visibility of class properties and methods.

In Python, a single underscore "_" before an object name indicates that the object is meant to be private, meaning that it should not be directly accessed or modified outside of the class that it is defined in.

The self parameter in Python is used to refer to the instance of an object within a class.

In Python 3, all classes automatically inherit from the object class.

Getters and setters, also known as accessors, are methods that are used to get and set the values of an object's properties.