It’s been a while since our last Medium newsletter and many great articles were published here in Kt. Academy. Let’s make a fast review of them all. Effective Kotlin series Item: Consider aggregating elements to a map Excluded Item: Use tail recursion to achieve efficient recurrence Enum vs Sealed class — which one…

As for many languages, there are many free courses teaching Kotlin online. Many of them are made by JetBrains or Google, who are interested in us learning Kotlin, but there are also some made by the community members. Let’s see how you can learn Kotlin for free. JetBrains Academy

Nowadays, because of the quarantine, many people cannot do their job. They have a lot of time, but an uncertain future. In that time, programmers seem to be doing great. Not only we can do our job remotely perfectly well, but also demand for our services grew. Willing to help…

It is not uncommon to have a bigger set of elements we need to access many times. It might be: A cache — data that we download from some service and then keep in local memory to access them more quickly A repository with data loaded from some file An…

Update: Here is the newest version of this article. TL;DR: Enums have supporting functions like valueOf, values or enumValues what makes them easier to iterate over or serialize. Just like classes, they can have custom methods or hold data, but always one per enum value. They are perfect to represent…

This was meant to be an item in the Effective Kotlin (without memes), although I decided to not include it in the final book due to limited tailrec capabilities and, well, limited utility of this modifier. …

Lately, the most common question people ask me is not “How are you doing?” but instead, “When Effective Kotlin will be available in print?”. I honestly do everything I can to make it as soon as possible, but when you are bound to provide high quality, you are not a…

Extension functions — functions that are used like member functions, but yet defined outside of the class — are a great feature and loved by many. Although they started being overused what leads to problems we don’t know how to solve yet. Instead, you can see how some libraries avoid…

Update: Here is the newest version of this article. This is a part of the book Effective Kotlin. Conteptually, an extension of this article by the same author, that base on Item 1 from the book Effective Java by Joshoua Bloch. The most common way for a class to allow…