lib.lists.reverseList: avoid subtraction

2026-06-24 18:30:03 -04:00
parent 4e2f331f87
commit 4b623fa2b8
1 changed files with 3 additions and 2 deletions
@@ -1125,9 +1125,10 @@ rec {
  reverseList =
    xs:
    let
-      l = length xs;
+      # subtract one to save an __sub call on every element
+      lastIndex = length xs - 1;
    in
-    genList (n: elemAt xs (l - n - 1)) l;
+    genList (n: elemAt xs (lastIndex - n)) (lastIndex + 1);

  /**
    Depth-First Search (DFS) for lists `list != []`.