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lib.lists: undeprecate crossLists (#393573)

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Philip Taron
2025-10-09 22:19:57 +00:00
committed by GitHub
parent a8e71f2490 d1de5d4748
commit 1677539966
1 changed files with 2 additions and 14 deletions
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16
lib/lists.nix
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@@ -1814,7 +1814,7 @@ rec {
=> [ "13" "14" "23" "24" ]
```
The following function call is equivalent to the one deprecated above:
If you have an attrset already, consider mapCartesianProduct:
```nix
mapCartesianProduct (x: "${toString x.a}${toString x.b}") { a = [1 2]; b = [3 4]; }
@@ -1822,19 +1822,7 @@ rec {
```
:::
*/
crossLists = warn ''
lib.crossLists is deprecated, use lib.mapCartesianProduct instead.
For example, the following function call:
nix-repl> lib.crossLists (x: y: x+y) [[1 2] [3 4]]
[ 4 5 5 6 ]
Can now be replaced by the following one:
nix-repl> lib.mapCartesianProduct ({x,y}: x+y) { x = [1 2]; y = [3 4]; }
[ 4 5 5 6 ]
'' (f: foldl (fs: args: concatMap (f: map f args) fs) [ f ]);
crossLists = f: foldl (fs: args: concatMap (f: map f args) fs) [ f ];
/**
Remove duplicate elements from the `list`. O(n^2) complexity.