What are design patterns: why use them, classification, pros and cons

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Ercole Palmeri 2024-03-26
Design pattern
In software engineering, design patterns are optimal solutions to problems that commonly occur in software design.
They are like pre-built, tried-and-tested designs that you can customize to solve a recurring design problem in your code.
Table of Contents
What is a design pattern?
What makes up a design pattern?
Why use them?
Classification of design patterns
Example of a design pattern in Laravel: Facade
Problem
Solution
Real example in PHP
Estimated reading time: 6 minutes

What is a design pattern?
A design pattern is not code that we can copy and insert into our program, as we can qatar rcs data with standard functions or libraries. A design pattern is a general concept that is capable of solving a specific problem. Basically a model whose details we can follow and implement a solution that fits the reality of our program.

I modelli vengono spesso confusi con gli algoritimi, perché entambi i concetti descrivono soluzioni tipiche ad alcuni problemi noti. While an algorithm always defines a clear set of actions that can reach a certain goal, a model is a description of the highest level of a solution. Il codice dello stesso modello applicato a due programmi diversi podrège essere diverso.

Wanting to make an analogy, we can think of a cooking recipe: both have clear steps to achieve a goal. However, a model is more like a project, from which you can see what the result and its characteristics are, but the exact order of implementation depends on us who write the code.