Well-structured Logic: A Golang OOP Tutorial
Can Golang be object-oriented? Go is post-OOP but can still leverage concepts like binding functions to types (aka classes), constructors, subtyping, polymorphism, dependency injection, and testing with mocks.

Leonhard Holz
As a JS Developer, ES6 Classes Are What Keep Me Up at Night
JavaScript is an oddball of a language with numerous approaches to almost any problem. When ES6 added the “class” keyword, did it save the day or just muddy the waters? In this article, Toptal Freelance JavaScript Developer Justen Robertson explores OOP in modern JS.

Justen Robertson
Unit Testing and Coding: Why Testable Code Matters
In this article, I will show that unit testing itself is quite easy; the real problems that complicate unit testing, and introduce expensive complexity, are a result of poorly-designed, untestable code. We will discuss what makes code hard to test, which anti-patterns and bad practices we should avoid to improve testability, and what other benefits we can achieve by writing testable code. We will see that writing testable code is not just about making testing less troublesome, but about making the code itself more robust, and easier to maintain.

Sergey Kolodiy
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