From 6f2059607b75f9bc7e1dee3e0a26d49f3e389e93 Mon Sep 17 00:00:00 2001
From: h7x4 <h7x4@nani.wtf>
Date: Tue, 8 Apr 2025 16:11:18 +0200
Subject: [PATCH] count: init

---
 flake.nix     |  1 +
 src/count.nix | 14 ++++++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 src/count.nix

diff --git a/flake.nix b/flake.nix
index 8ea6191..6d32582 100644
--- a/flake.nix
+++ b/flake.nix
@@ -11,6 +11,7 @@
     inherit util;
 
     collect = import ./src/collect.nix lib;
+    count = import ./src/count.nix lib;
     filterAttrs = import ./src/filterAttrs.nix lib;
     filterOverrides = import ./src/filterOverrides.nix lib;
     findFirstIndex = import ./src/findFirstIndex.nix lib;
diff --git a/src/count.nix b/src/count.nix
new file mode 100644
index 0000000..e8e8864
--- /dev/null
+++ b/src/count.nix
@@ -0,0 +1,14 @@
+lib:
+let
+  countOld = pred: builtins.foldl' (c: x: if pred x then c + 1 else c) 0;
+
+  countNew = pred: list: builtins.length (builtins.partition pred list).right;
+
+  countNewNew = pred: list: builtins.length (builtins.filter pred list);
+
+  bigdata = lib.imap0 (i: _: i + 1) (lib.replicate 999999 null);
+in {
+  old = countOld (x: (lib.mod 10 x) == 0) bigdata;
+  new = countNew (x: (lib.mod 10 x) == 0) bigdata;
+  newNew = countNewNew (x: (lib.mod 10 x) == 0) bigdata;
+}