Code Freely, Live Fully
Code Freely, Live Fully
Introduction The flyweight pattern is a pattern that helps minimize memory usage by sharing and reusing data. A common example is wordprocessor where each character not only holds the character like ‘A’ but also things like markup and formatting data.…
Introduction Just for fun and to try out Rust operator overloading capabilities, I decided to write a quaternion library. If you don’t know what quaternions are, they are basically complex numbers on steroids. If you want to know more, there…
Introduction The Chain of Responsibility (CoC) pattern describes a chain of command/request receivers. The client has no idea which one of the receivers will handle the request. The beauty of the pattern is again uncoupling: the sender and the receiver…
Introduction The singleton pattern restricts the instantiation of a class to a single instance. The singleton pattern makes it possible to ensure that: One of the main uses of the singleton pattern is logging, as all clients who wish to…
Introduction The command pattern is a behavioral design pattern. It is used by an Invoker to perform one action or a series of actions on objects, called Receivers. The Invoker is unaware of the nature of the receiving objects, it just knows about…
Introduction The facade pattern is used as a way to hide more complex logic. A facade can do the following: A facade pattern is typically used in the following cases: What does it look like? Well, it is quite simple:…
Introduction The Interpreter pattern can be used to interpret and evaluate sentences in a language. The idea is to make a class for each symbol, both terminal and non-terminal and construct a syntax tree which can be evaluated and interpreted.…
Introduction The mediator pattern is a pettern used when you want to simplify communication i.e. message dispatching in complex application. It involves building a mediator where each object can delegate its communication, it also routes the messages to the right…
Introduction The memento pattern can be used to (partially) expose the internal state of an object. One use case for this pattern is to serialize an object to a file or as JSON for example, another is to build an…
Introduction The state pattern is a behavourial state pattern, which allows an object to change its behaviour when its internal state changes. Since this sounds quite cryptic, let’s have a look at the diagram: A short breakdown: As you can…
Introduction The template method pattern is a behavourial design pattern which allows you to define the template, or the skeleton of an operation in a base class, while allowing the subclasses to override specific steps or all steps of the…
Introduction In a previous post I described the Builder pattern in Rust. However, even though the solution worked, it did not look very elegant. Hence, I found a more elegant solution, which I will present here. Let us remind ourselves…
Introduction The strategy pattern is a behavorial design pattern that allows you to define a family of algorithms, encapsulate them as an object, and with the help of traits make them interchangeable. What does it look like? A short explanation:…
Introduction The prototype-pattern is a creational design pattern that allows us to create new objects by cloning existing ones, i.e. the existing objects function as a kind of template. This can save time in some cases when for example an…
Introduction The observer pattern is a software design pattern that allows an object, usually called the subject, to maintain a list of dependents, called observers, and notify them automatically of any state-changes. Many languages have this pattern either built-in or…