Code Freely, Live Fully
Code Freely, Live Fully
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…
Introduction You can use the memento pattern 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 In Design Patterns, the Iterator is a way of traversing over a container, that is access each of the container’s elements. It is used as a convenient way to traverse over lists or arrays, but it could also be…
Introduction Delegation is like passing a job to someone else. For example, while performing a download from a file from the web, a delegate could handle the events, like starting the download, maintaining updates on the download’s progress, and handling…
Introduction Sometimes, to save time and resources, it’s handy to have a collection of ready-to-use items, which we call a “pool.” This is especially helpful for things that are costly to create, like database connections. Here’s the simple concept: You…
Introduction Using a fluent interface can make your code easier to read. This pattern allows you to connect method calls, as each method returns the object or context. When implemented well, it can create a kind of specialized language for…
Introduction Most applications require business rules, such as data validation. It’s crucial to implement these rules in a way that’s flexible, clear, and easy to maintain. The Specification pattern offers a solution, allowing the creation of reusable business rules that…