As a favorite weekend activity for the Scala programmers, I wrote my own JSON library called sjson-new.
sjson-new is a typeclass based JSON codec library, or wit for that Jawn. In other words, it aims to provide sjson-like codec facility in a backend independent way.
In terms of the codebase I based it off of spray-json, but conceptually it's close to Scala Pickling in the way it deals with data. Unlike Pickling, however, sjson-new-core is free of macros and runtime reflection beyond normal pattern matching.
For me (and for many of the 27 organizers, I imagine) ScalaMatsuri is a lifestyle. It's true that there was a successful two-day conference in Tokyo with 550 participants. But for us the organizers, the preparation has been going on since February 28th, for 11 months. Despite the fact that my contribution was small, planning ScalaMatsuri 2016 was by far the most amount of involvement I've committed to. Through the course of planning months, there were many discussions over Slack, Hangouts, and occasionally even face-to-face. The fun part was coming up with the ideas together, and seeing them materialize. Sometimes, I was the one coming up with radical ideas that were being executed by someone else, while other times, it was the opposite case and I was getting my hands dirty.
For a flexible language like Scala, it's useful to think of subset of the programming language, like your own personal Good Parts, and opinionated style guides.
To try -Yno-lub, you can drop in the following sbt plugin to project/ynolub.sbt:
When Scala's type inferencer finds type A and type B to unify, it tries to calculate the lub (least upper bounds) of two types with regards to <:<. This process is sometimes called lubbing. Here are some of the examples:
Two days of #ScalaMatsuri ended as a huge success. But for the next year, I'm leaving ourselves a few homeworks to work on. As the title suggests, the next goal that we should aim for is universal access. In Scala language, universal access principle indicates the fact that both methods and fields can be accessed interchangeably from outside.
For a conference, I mean universal access to mean being more inclusive to various groups of people:
This year was the second Scala conference in Japan. We've changed the name to ScalaMatsuri, which means Scala festival in Japanese. 300 tickets sold out. With invited guests and free tickets for sponsors, there may have been even more people. The venue was at CyberAgent, which runs blog service and online ad services.
The need for regular expressions is real. Whenver I need to transform a set of text files it usually ends up with fumbling through the documentation of find command, zsh, and StackOverflow Perl questions. I would rather use Scala instead of muddling through Perl. It's really the matter of my familiarity than anything else.
For example, I now have over a hundred reStructuredText files that I want to convert into markdown. I first tried pandoc, and it looked mostly ok. As I was going through the details, however, I noticed that many of the code literals were not converting over as formatted. This is because they were formatted using either single ticks or using Interpreted Text. Preprocessing the text with a series of regex replacements should work.