Last week we discussed encapsulation and inheritance. Today we will discuss last part of basics of Object-Oriented Programming: Polymorphism.

Ruby - it's an object-oriented language. If we want to understand ideas that Matz put into Ruby - we should understand basics of object-oriented programming (OOP). In this post I'll cover encapsulation and inheritance. I'll devote separate post for polymorphism.

Recently I described how to use inject to solve relatively complex tasks in one-two lines of code.

Today I want to describe another useful method from Enumerable module - each_with_object.

Hey! In previous article we discussed blocks and today I'm going to describe lambdas and Procs. We will understand similarities and difference between them.

Today we're going to discuss simple but interesting topic. We will learn blocks by examples. We will understand what's block and how we can use it to create flexible apps.

Yes, this topic has been discussed many times and almost all people know that methods in Ruby can be public, private and protected. But it's not enough to know which access levels we have. Main point here to understand a difference. For example difference between private and protected levels of an access is not that obvious. So today I would like to talk about that difference.

Hi there. Today we will discover Dependency Injection (DI). To understand all benefits of dependency injection we should understand why dependencies are bad.

Today's post will be more theoretical rather than practical. But it's worth reading because Command-Query Separation allows you to improve design of methods. So today we will discuss CQS.

Hi there. When you work on a greenfield project everything goes well. But at some point each big project has this issue with DataBase performance. It get's not easy to make changes to DB structure, insert data. Queries are getting slower and slower. It's time to do something with it.

Hi, today we will continue learning new patterns (see also: decorator and template). This time we will go through very popular pattern - Strategy.