From 1fa9872ad4683de387b2594ed25677cf3fd99309 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Sun, 25 Jun 2023 00:06:43 -0500
Subject: add protein

---
 src/protein/protein.js | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 src/protein/protein.js

(limited to 'src/protein/protein.js')

diff --git a/src/protein/protein.js b/src/protein/protein.js
new file mode 100644
index 0000000..0223203
--- /dev/null
+++ b/src/protein/protein.js
@@ -0,0 +1,10 @@
+const xnor = (a, b) => a === b ? 1 : 0;
+
+export function compare(pa, pb) {
+	if (pa.length !== pb.length) {
+		throw new Error(`attempted to compare proteins with different lengths: ${pa.length} vs ${pb.length}`);
+	}
+	return (1/pa.length) * pa
+		.map((_, i) => xnor(pa[i], pb[i]))
+		.reduce((acc, val) => acc + val, 0)
+}
-- 
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