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scala

A collection of 15 posts

Do you really need Await ?

When doing asyc processing in Scala, you might use Future and Await. But you can avoid the latter. Here are some explanations.

Configuration with types and style

Configuration with types and style

Passing by a Config object is common practice in Scala. But here is why I do not like this pattern...

2/2- Preparing for Scala 3

2/2- Preparing for Scala 3

During the last episode [https://www.enhan.eu/preparing-scala-3-part1/], we built a structure called Vect whose size is encoded in the type. There were some shortcomings however, which we will fix in this article. The goal still being to write, a zip function whose calls compile only with Vect of

1/2- Preparing for Scala 3

1/2- Preparing for Scala 3

I know Scala 3 is not there yet. But Dotty [https://dotty.epfl.ch] is, and it is getting closer and closer to be Scala 3. As a Scala developer, brace yourself to something new. Similar, yet new. And in the context of pure Functional Programming, where are we heading

3/n - How do I in FP... trying several input for the same function

In the previous entry [https://www.enhan.eu/how-to-in-fp-2/] of this series, I wrote about error recovery in a functional way. But sometimes, we want to try several inputs until we retrieve (optionally) a result. This is the case if you have a function which compute a location from a

3/3 An Autumn of conferences: Scala.io

3/3 An Autumn of conferences: Scala.io

For the third year in a row, I was attending Scala.io [https://scala.io/] in Lyon at the end of October. Like in 2018, the conference spanned on 3 days, the first one being dedicated to workshops. I only had a ticket for the 2 days of talks. As

2/n - How do I ... in FP: selective recovery on error

2/n - How do I ... in FP: selective recovery on error

Problem setup: Let's say we have this ADT to model some errors sealed abstract class AppError extends Product with Serializable object AppError{ case class ParseError(msg: String, field: String) extends AppError case class GeneralError(msg: String) extends AppError case class MissingValueError(name: String) extends AppError } And some existing

Tagless Final Memo (in Scala)

Tagless Final Memo (in Scala)

Sometimes, the typeclass syntax in Scala can be confusing. Here is a simple memo to quickly remember how it is encoded in Scala 2.

Clojure seen from a Scalaist

Clojure seen from a Scalaist

This post is about the last few weeks and my feelings/conclusion about Clojure & its ecosystem.

New horizons

It's been a while since the last article here, but I am back. I now work at Linkfluence [https://www.linkfluence.com/], and I spend my days writing code mostly in Scala. So far it is an incredible experience: I return to professional Scala and it feels good.

functional programming

Scala.io 2018

In the end of October 2018, in Lyon, the Scala.io conference took place. I was there and in this article are sumed up my notes and memories from this event. It is not an easy task to sumarize every presentation I went to, so instead of trying to do

1/n - How do I ... in FP : Validation

functional programming Featured

1/n - How do I ... in FP : Validation

Here is a small post-it like article. Just to remember some useful patterns we hit in everyday life as software developers. This post is the first in a (potentially infinite) stream. How do I validate things The case The basic. Let say we are in a web app exposing a

That moment when...

The moment had to arrive eventually. You know, that moment when after months and years learning Functional Programming (FP), you realize and understand why you would need Heterogeneous Lists (HLists) and why Shapeless is a great Scala library. It all started at work, with the very basic task of validating

Skiing in Singapore - Episode 1

About 4 months ago, a friend of mine sent me a link to this fun challenge [http://geeks.redmart.com/2015/01/07/skiing-in-singapore-a-coding-diversion/] proposed by Redmart [https://redmart.com/]. The goal is to find not the shortest but the longest path in a mountain. It is a perfect exercise

Some fun with akka-streams and akka-http

You may have heard about Reactive Programming, the Reactive manifesto [http://www.reactivemanifesto.org/] or the attempt to standardize [http://www.reactive-streams.org/] the concept of streams. Quick note, let's forget about this last one, it is not an end-user standard. Akka Streams [http://akka.io] is an