1 files changed, 13 insertions, 0 deletions
diff --git a/lib/lists.nix b/lib/lists.nix
index 3835e3ba69c..15047f488f4 100644
--- a/lib/lists.nix
+++ b/lib/lists.nix
@@ -821,6 +821,19 @@ rec {
    */
   unique = foldl' (acc: e: if elem e acc then acc else acc ++ [ e ]) [];
 
+  /* Check if list contains only unique elements. O(n^2) complexity.
+
+     Type: allUnique :: [a] -> bool
+
+     Example:
+       allUnique [ 3 2 3 4 ]
+       => false
+       allUnique [ 3 2 4 1 ]
+       => true
+   */
+  allUnique = list: (length (unique list) == length list);
+
+
   /* Intersects list 'e' and another list. O(nm) complexity.
 
      Example: