Let's delve outside of our comfortable groups of like-minded engineers to explore the unknown once in a while. It's healthy!

A conference can be so much more than just its talks. These were my experiences at Friendly.rb, as a once-skeptic.

The dependency inversion principle is about inverting dependencies. Right? Actually, maybe not.

The Interface Segregation Principle is about designing thin, cruft-free interfaces which results in reduced coupling.

The Liskov Substitution Principle applies to any OOP language. On the surface it is a structural principle, but its true lesson is concerned with behaviour.

We visit the second SOLID principle: the open–closed principle (OCP). Does it still hold up, or is it bad advice in today's agile world?

The SOLID principles are required learning for software engineers dealing with object-oriented code. Think you know them? Let's take each one apart together.

Dependencies are free chunks of functionality, except when they're not. They come with hidden costs which need careful consideration.

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