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authortv <tv@krebsco.de>2021-03-03 03:06:30 +0100
committertv <tv@krebsco.de>2021-03-03 03:06:30 +0100
commit317b9549a217e552bf8aa314a6d6f46b532c6a8a (patch)
treea8940ed6055a6be9d5c025322fb640586a9526ef /lib/default.nix
parent7e158f1c533de5ddc3a3cf77d360338c60ee3724 (diff)
lib: add compose
Diffstat (limited to 'lib/default.nix')
-rw-r--r--lib/default.nix4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/default.nix b/lib/default.nix
index 2efeec078..4190f8f5f 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -15,6 +15,10 @@ let
uri = import ./uri.nix { inherit lib; };
xml = import ./xml.nix { inherit lib; };
+ # compose a list of functions to be applied from left to right, i.e.
+ # compose :: [ (xm -> xn) ... (x1 -> x2) (x0 -> x1) ] -> x0 -> xn
+ compose = foldl' (f: g: x: f (g x)) id;
+
eq = x: y: x == y;
ne = x: y: x != y;
mod = x: y: x - y * (x / y);