Krzysztof Kempiński (kkempin)

Builder design pattern in Elixir

SWOT analysis of Ruby on Rails framework. Strengths, weaknesses, opportunities and threats of Rails in 2017.

A chain of responsibility is a design pattern that allows to decouple a sender of a request from its receiver.

How to create your own Elixir package from scratch and how to upload it to Hex.pm

Basics of CoreData framework, which is a tool for iOS, macOS, tvOS and watchOS platforms to manage objects, lifecycle and persistence.

Master-slave replication for PostgreSQL (postgres) database with Ruby on Rails on Heroku

We can use use Facade design pattern in Rub on Rails to remove that responsibility of preparing data for the view and create unified face.

W serwisie iTunes, Spreaker i Stitcher można znaleźć podcast “Porozmawiajmy o IT”, który założyłem wraz z Jackiem.

W serwisie YouTube można znaleźć mój kanał, który nazwałem “Świat oczami programisty”.

Builder pattern in Ruby is useful when the algorithm how to build an object is something independent of the parts that makes the object.

During my career I had a chance to work with many developers. Besides that I was hiring new programmers to the companies.

I was observing my 2.5 year old son how is he spending time watching YouTube on my iPhone. I was trying to notice how he was using the app…

Yesterday I passed PSM I exam and got my certificate (http://www.scrum.org/user/266898) 😎

Cztery obszary rozwoju osobistego: fizyczny, społeczny, mentalny i duchowy.

Anybody who has been working as a programmer knows how many disturbances can happen during the day. You can imagine things like top…

Size of your success is a size of your comfort zone.

Although core team and the community behind Ruby on Rails is working very hard to ensure that this framework is providing high level of…

PostgreSQL 9.3 introduced new kind of SQL join type that can be useful for solving problems that needed some more advanced techniques (like…

No, it’s not gonna be about pizza, burgers and fries. It’s not gonna be about cola and beer. And even it’s not gonna be about coffee…

Jak to było u nas z przeprowadzką na Maltę?

I want to show you a simple catalog of design patterns for object oriented programming that are described in the great book Design…

I want to show you a simple catalog of design patterns for object oriented programming that are described in the great book Design…

Hopefully in this year (2017) we will see Ruby 2.5.0 released.

According to GoF and their great book “Design Patterns: Elements of Reusable Object-Oriented Software”, visitor pattern: