Test networks, Standalone Nodes, Solidity, and the Remix IDE — Disclaimer This is my second piece for introductory Ethereum concepts and technologies. If you want more context in the Ethereum world regarding Blockchain, Smart Contracts, Tokens, and some of their great use cases, take a look at my first one at Using an Ethereum Node as your Application Backend. Let’s rock!! Introduction …

Disclaimer This piece is not intended to introduce the core aspects of blockchain or the Ethereum network protocol, even though I decided to go through some interesting topics. The main idea discussed here is the possibility to use the technology of blockchain to create general applications within a fully controlled environment…

Mocking is almost always required for unit tests because it provides a way to control how other modules behave allowing us to test our units without relying on them, which is the primary goal of a unit test script. In Python, we have the unittest.mock module to create them and…

Even though a chess game is much more complex than a game of checkers they are, with a deep look into its mechanics, much more related than we could imagine. …

Introduction Collections are possibly the wider and trickier subject in the Java language and when we understand how they work internally we can make right decisions for our code's requirements. Since all computational process requires time to be done, when we have more than one option to select, the most important…

There are two kinds of database design. One is used to accomplish the requirements of an end-user application and the other to provide modeled records for data engineers. The first is designed for OLTP (Online Transactional Processing) systems, used to persist operational data and characterized by a high normalized schema…

Graph theory, along other pure theoretical subjects like Game Theory, System Theory, so forth, are one of my favorite reading since I discovered it. I follow contents and related people in all of my social networks — and I need to mention that Twitter is the best one for those…

A Few Words About the Motivation Behind This Article… The idea about this article came from a discussion I had with various devs during a GDG meetup in Belo Horizonte, Brazil. After lots of arguments on many subjects — including a Ruby/Java discussion about which is better — I asked someone…

O cavalo é definitivamente a peça mais característica do xadrez. Normalmente bem entalhada e com mais detalhes que as outras, transmite uma preocupação constante ao adversário, dado seu movimento não linear, ao contrário de todas as outras peças. …