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Introduce builtins.groupBy primop

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This function is very useful in nixpkgs, but its implementation in Nix
itself is rather slow due to it requiring a lot of attribute set and
list appends.
This commit is contained in:
Silvan Mosberger 2021-12-02 17:46:44 +01:00
parent 2ff71b0213
commit 90700736c7
3 changed files with 55 additions and 0 deletions
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3
doc/manual/src/release-notes/rl-next.md
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@ -5,3 +5,6 @@
* `nix develop` now has a flag `--unpack` to run `unpackPhase`.
* Lists can now be compared lexicographically using the `<` operator.
* New built-in function: `builtins.groupBy`, with the same functionality as
Nixpkgs' `lib.groupBy`, but faster.