Lucas Payr

@orasund

Living and breathing functional programming

Linz, AustriaJoined May 2023

About

Hi there, I'm a Software developer and have been programming since 2010.

I came in contact with functional programming when I did my master's in computer mathematics. I learned functional programming using Lisp, Prolog and Mathematica. But then I found my perfect language in Elm and never looked back.

At my job, I work with Kotlin and Typescript, which work best by writing a hybrid of FP and OOP.

Ever since I started working, I use field notes to track my thoughts and discoveries. My blog contains the best parts of those notes.

Available for

Mentorship in Elm. Reading groups related to functional programming

Lucas Payr's blogs

Functional Fieldnotesfunctional-fieldnotes.hashnode.dev11 posts

Articles Comments

Recently published

LPLucas Payrfunctional-fieldnotes.hashnode.devJun 6 · 3 min read

How to use Google Gemini as a Template for a React App

Let's say we just spent a couple of hours inside Gemini creating a first draft of an idea. Now we want to take this draft and turn it into a functional React app. Setup The first step is to set up a

0

LPLucas Payrfunctional-fieldnotes.hashnode.devApr 2 · 2 min read

Things I leared while Vibe Coding

I was using Gemini in the free version in Feburary 2026. Keep everything in one file - don’t try to scale. The AI should only ever care about a single file (and should also only have access to one fi

0

LPLucas Payrfunctional-fieldnotes.hashnode.devAug 17, 2025 · 3 min read

Using Immutable Collections in JavaScript

At work, my team and I decided to migrate from Lodash to Immutable.js. I was tasked to do the migration for one of our older codebases, where Lodash was heavily in use. During the migration, I noticed, that I actually could just use modern JavaScript...

0

LPLucas Payrfunctional-fieldnotes.hashnode.devJul 18, 2024 · 4 min read

Exploring gleam/bool

A good way of really understanding a programming language is to go deep into the standard library and really get to know every single function. In this blog post, we will explore the bool module of the gleam standard library. I might look into other ...

0

LPLucas Payrfunctional-fieldnotes.hashnode.devMay 22, 2024 · 4 min read

3 Reasons Enums with superpowers Are Rare in Enterprise Software

You might have heard of "Enums with superpowers", "Tagged Union Types" or Algebraic Data Types(ADT). It is heavily used in functional programming. And yet, you rarely see them in enterprise codebases. Why is that? A common use case for ADTs is to rep...

0

Lucas Payr

About

Available for

Lucas Payr's blogs

Recently published

How to use Google Gemini as a Template for a React App

Things I leared while Vibe Coding

Using Immutable Collections in JavaScript

Exploring gleam/bool

3 Reasons Enums with superpowers Are Rare in Enterprise Software

Search Hashnode

Lucas Payr

About

Available for

Lucas Payr's blogs

Recently published

How to use Google Gemini as a Template for a React App

Things I leared while Vibe Coding

Using Immutable Collections in JavaScript

Exploring gleam/bool

3 Reasons Enums with superpowers Are Rare in Enterprise Software