LELelouBil·Jan 16, 2023Submission
DataFixerUpper: Incremental building and merging of data transformations
18 points · Open discussionMojang
DataFixerUpper
Java2018–2023
Mojang / DataFixerUpper
DataFixerUpper
A set of utilities designed for incremental building, merging and optimization of data transformations.
7Distinct people
7Mentions
0Explicit recommenders
1.3KGitHub stars
What to know before exploring
What it is
A set of utilities designed for incremental building, merging and optimization of data transformations.
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
- mojang/brigadier · linked in 2 of the same discussions
Mentioned in the same Hacker News threads. That is not proof they are substitutes.
This week on Hacker News
Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 2:04:58 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year7 dated mentions
Observed mentions: 2018-10-06 20:02:22 UTC to 2023-01-16 01:59:26 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 5 | 0 | 5 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 1 | 1 | 0 |
What Hacker News says
7 sourcesNot me personally; but I remember that Mojang used Lenses in some of the Minecraft (or related tools) code: https://github.com/Mojang/DataFixerUpper/blob/8b5f82ab78b30f...
In LensesHonest question, if you look at this:
https://github.com/Mojang/DataFixerUpper/blob/8b5f82ab78b30f...
Is that understandable to you? And does this really make solving some problems easier?
I've dabbled a bit in Haskell, but never got further than functors, applicatives and monads, and I always wonder whether this kind of stuff really helps.
(It probably doesn't help that Java is very verbose, especially compared to Haskell...)
In Microsoft open sources parts of Minecraft: Java EditionAs some who loves the lens library in Haskell, this makes me in awe:
https://github.com/Mojang/DataFixerUpper/tree/8b5f82ab78b30f...
Profunctors, lenses, prisms, traversals… all there :)
In Microsoft open sources parts of Minecraft: Java EditionClickable links. If you indent text, that gets formatted as code.
[0]: https://github.com/Mojang/brigadier
[1]: https://github.com/Mojang/DataFixerUpper
In Microsoft open sources parts of Minecraft: Java EditionAh yes, profunctor optics, an excellent topic for a freshman CS student's weekend project:
https://github.com/Mojang/DataFixerUpper/blob/master/src/mai...
In Microsoft open sources parts of Minecraft: Java EditionThe code is being open-sourced as MIT-licensed libraries. The libraries mentioned in the article are Brigadier [0], a command parser and dispatcher, and Data Fixer Upper [1], which is used to migrate older chunk data to newer versions of Minecraft.
Apparently more libraries are in the pipeline to be open-sourced alone these two. One possibility is Blaze3D, which is a rewrite of the rendering engine that is planned on being included in Minecraft 1.14.
[0]: https://github.com/Mojang/brigadier
[1]: https://github.com/Mojang/DataFixerUpper
In Microsoft open sources parts of Minecraft: Java Edition