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functional programming

A collection of 9 posts

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

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

2/3 An Autumn of conferences: Lambda World Cadiz

2/3 An Autumn of conferences: Lambda World Cadiz

Two weeks after the Devfest Toulouse, I was in Cádiz to attend 𝛌World [https://cadiz.lambda.world]. It is a conference focused on Functional Programming. It was composed of two days, one mostly dedicated to workshops while the second one was only about talks. For my first time there, the

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.

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

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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

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