How I finally understood the Single Responsibility Principle
The Intro Welcome to the first stop of a five-part road trip through SOLID . Five letters, five principles, five posts, one tiny project per post th…
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SOLID Principles in PHP and Laravel: First Part (SRP or Single Responsibility Principle)
SRP says a class should have one reason to change. That does not mean one method or one line. It means one job. If a database change, a new JSON for…
SOLID Without the Acronym: It's Just Cohesion and Coupling
SOLID isn't really five independent principles. It's mostly two long-standing software design ideas expressed in different ways. High cohesion — kee…
The $26 Billion Leak: Why Frameworks Are Making Your Codebase Rot (and How Hexagonal Isolation Fixes It)
According to a 2024 vFunction survey, over 50% of companies watch more than a quarter of their entire IT budget vanish into technical debt. This isn…
Simple Factory, Factory Method, Abstract Factory — Which One Do You Need?
The Problem You're building a system that supports multiple databases — MySQL, PostgreSQL, MongoDB. Different services in your application need to c…
Never Create an Invalid Object Again — The Builder Pattern
A real story from building a manuscript submission system at a scientific publishing company. We were building a system at a Publishing Company that…
Stop Editing Working Code: Understanding the Open/Closed Principle in Python
Every time a new requirement arrives, do you find yourself opening the same function and adding another elif block? If yes, your code may be signali…
Why Laravel's Service Container Feels Like Magic: Dependency Injection Explained
1. Hook & Problem Statement You’ve been there. You're building a Laravel application, and everything is going smoothly. You type Route::get('/or…
SINGLE RESPONSIBILITY PRINCIPLE
SINGLE RESPONSIBILITY PRINCIPLE (SRP) A class should have one, and exclusively one , reason to change. In other words, we shouldn't have a single cl…
SOLID Principles in Ruby on Rails
SOLID Principles in Ruby on Rails SOLID is not a Rails or Ruby concept. It's a set of five object-oriented design principles that apply to any langu…
SRP's Vocabulary Problem: Why Every Reformulation Failed
I've just published SRP's Vocabulary Problem: Why Every Reformulation Failed . The Single Responsibility Principle has been criticized as vague, amb…