The F# Advent Calendar is back—and we’d love you to be part of it. Since 2014, F# developers have used this December tradition to share the things they’ve built, learned, and wondered about. This is our 13th edition, and it’s a chance to hear from the whole community: newcomers and veterans, library authors and curious tinkerers, people solving everyday problems and people exploring ideas just for fun.
From December 1 through Christmas Eve, there are 24 main dates to fill, with bonus posts welcome when there’s more to share. Your contribution doesn’t need to be a grand project or an exhaustive guide. A useful technique, a small experiment, a story from a project, or a lesson you learned can give someone else a new idea to try.
Got something F#-related you’d like to share? Choose a date and join us in making this year’s calendar a celebration of the language and the people around it. 🧑🎄
How to take part
- Pick an F#-related topic and reserve a date by posting on BlueSky, X, or leaving a comment on this post. You can keep your topic secret until publication day if you like.
- Prepare a blog post or video in English.
- Publish it on your assigned date.
- Post the link to your post on BlueSky or X with hashtags #fsharp and #FsAdvent.
| ID | Date | Author | Post Title |
|---|---|---|---|
| #2601 | Dec 01 (Tue) | ||
| #2602 | Dec 02 (Wed) | ||
| #2603 | Dec 03 (Thu) | ||
| #2604 | Dec 04 (Fri) | ||
| #2605 | Dec 05 (Sat) | ||
| #2606 | Dec 06 (Sun) | ||
| #2607 | Dec 07 (Mon) | Matthew Watt | |
| #2608 | Dec 08 (Tue) | ||
| #2609 | Dec 09 (Wed) | ||
| #2610 | Dec 10 (Thu) | ||
| #2611 | Dec 11 (Fri) | Patrick Stevens | A deterministic .NET runtime for simulation testing |
| #2612 | Dec 12 (Sat) | ||
| #2613 | Dec 13 (Sun) | ||
| #2614 | Dec 14 (Mon) | ||
| #2615 | Dec 15 (Tue) | ||
| #2616 | Dec 16 (Wed) | Angel Munoz | |
| #2617 | Dec 17 (Thu) | ||
| #2618 | Dec 18 (Fri) | Guy Buss | |
| #2619 | Dec 19 (Sat) | ||
| #2620 | Dec 20 (Sun) | ||
| #2621 | Dec 21 (Mon) | ||
| #2622 | Dec 22 (Tue) | ||
| #2623 | Dec 23 (Wed) | ||
| #2624 | Dec 24 (Thu) |
Advent of Code
Alongside the F# Advent Calendar, we have a private Advent of Code board for people solving the December puzzles with F#. If you’re taking part this year, join us and tackle the challenges alongside fellow F# developers. Whether you’re aiming to solve every puzzle or just joining in when you can, you’re welcome.
History of F# Advent
F# Advent Calendar is a long tradition in the F# community
- F# Advent Calendar in English: 2025, 2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014
- F# Advent Calendar (in Japanese): 2025, 2024, 2023, 2022, 2021, 2020, 2019, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010
That inspired the C# Advent Calendar, Q# Advent Calendar, and many others.
