2 files changed, 42 insertions, 0 deletions
diff --git a/users/sterni/nix/num/default.nix b/users/sterni/nix/num/default.nix
new file mode 100644
index 000000000000..640493083722
--- /dev/null
+++ b/users/sterni/nix/num/default.nix
@@ -0,0 +1,16 @@
+{ ... }:
+
+rec {
+  inherit (builtins)
+    mul
+    div
+    add
+    sub
+    ;
+
+  abs = i: if i < 0 then -i else i;
+
+  inRange = a: b: x: x >= a && x <= b;
+
+  sum = builtins.foldl' (a: b: a + b) 0;
+}
diff --git a/users/sterni/nix/num/tests/default.nix b/users/sterni/nix/num/tests/default.nix
new file mode 100644
index 000000000000..ca5f861debe8
--- /dev/null
+++ b/users/sterni/nix/num/tests/default.nix
@@ -0,0 +1,26 @@
+{ depot, ... }:
+
+let
+
+  inherit (depot.nix.runTestsuite)
+    runTestsuite
+    it
+    assertEq
+    ;
+
+  inherit (depot.users.sterni.nix)
+    num
+    ;
+
+  testsBasic = it "tests basic operations" [
+    (assertEq "abs -4959" (num.abs (-4959)) 4959)
+    (assertEq "sum" (num.sum [ 123 321 1.5 ]) (123 + 321 + 1.5))
+    (assertEq "inRange"
+      (builtins.map (num.inRange 1.0 5) [ 0 0.5 3 4 4.5 5.5 5 6 ])
+      [ false false true true true false true false ])
+  ];
+in
+
+runTestsuite "nix.num" [
+  testsBasic
+]