From 07f95570063561c0f9d4f7f6f1c44368c1eab14d Mon Sep 17 00:00:00 2001
From: NaiJi <naijiworld@protonmail.com>
Date: Fri, 29 Apr 2022 04:11:45 +0000
Subject: [PATCH] Add '33.nix'

---
 33.nix | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 33.nix

diff --git a/33.nix b/33.nix
new file mode 100644
index 0000000..9b9a752
--- /dev/null
+++ b/33.nix
@@ -0,0 +1,11 @@
+with import <nixpkgs> { };
+let
+  list = [["a"] ["b"] ["c"]];
+  
+  attrList = [{a = 1;} {b = 0;} {a = 2;}];
+  catAttrs = atr: l: lib.fold (val: _l: if (builtins.hasAttr atr val) then [ (val.${atr}) ] ++ _l else _l) [] l;
+in
+rec {
+  example = builtins.concatLists list; #is [ "a" "b" "c" ]
+  result = catAttrs "a" attrList; #should be [1 2] 
+}
\ No newline at end of file