Depend on abstractions, not on concretions. Robert C. Martin Welcome back to the series on SOLID. By now, I’ll assume you’ve read my earlier post on the Interface Segregation Principle. In this post, we’ll be investigating the Dependency Inversion Principle which is not to be confused with Dependency Injection. Dependency Injection is only a form of […]
Make fine grained interfaces that are client specific. Robert C. Martin Welcome back to the series on SOLID. By now, I’ll assume you’ve read my earlier post on the Liskov Substitution Principle. The guts of this principle is that your interfaces should be very specific to the purpose. You shouldn’t have a super interface or […]
Derived classes must be substitutable for their base classes. Robert C. Martin Welcome back to the series on SOLID. By now, I’ll assume you’ve read my earlier post on the Open/Closed Principle. This principle is quite an obvious principle. I’m going to use the time-and-time-again Duck example below. Think: If it looks like a duck, swims […]
You should be able to extend the behavior of a system without having to modify that system. Robert C. Martin Welcome back to the series on SOLID. By now, I’ll assume you’ve read my first post on the Single Responsibility Principle. That is, each class should only have one responsibility (or a class should have […]
A class should have only one reason to change. Robert C. Martin I’m going to start a five blog post journey about the five principles behind SOLID. I’ll describe these in my own words and give examples of what breaks the rule and how to fix it. Now, what I’m not going to prescribe, is […]
I know you may think this topic is familiar. I mean, I did talk about it in my previous post about how you decide which package to take. But in this post, I’m going to be discussing this in broader terms. Think in terms of, frameworks, languages, tools, or debates in the company, or experimentation. […]
I’m curious to know what IDEs people out there use. But before anyone tell me what their IDE of choice is, I’ll give you mine and how I work. An IDE is a very personal choice, I think. I mean, at my current company we have people who use wildly different IDEs even for the […]
Today I want to talk about what agile means to me. I mean there is a standardised definition which I’ve quoted below from the agile manifesto. But, I think for most of us, being agile means that we can move quickly and break things. It means that we reduce risk to our businesses by being […]
One of the things I enjoy doing is running retrospectives. I know, I’m a bit weird. No one likes meetings. Well, this is one important meeting in agile. Why? Because a retrospective allows your team to reflect on the last sprint and make changes. These can be any changes: process, code, metrics etc. With these […]
