diff options
Diffstat (limited to 'lib/lists.nix')
-rw-r--r-- | lib/lists.nix | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/lists.nix b/lib/lists.nix index f7e09040a5a..424d2c57f55 100644 --- a/lib/lists.nix +++ b/lib/lists.nix @@ -464,8 +464,12 @@ rec { init = list: assert list != []; take (length list - 1) list; - /* FIXME(zimbatm) Not used anywhere - */ + /* return the image of the cross product of some lists by a function + + Example: + crossLists (x:y: "${toString x}${toString y}") [[1 2] [3 4]] + => [ "13" "14" "23" "24" ] + */ crossLists = f: foldl (fs: args: concatMap (f: map f args) fs) [f]; |