From 7eb1e664c8d6b0abdc86753fca6f5df280aa3428 Mon Sep 17 00:00:00 2001
From: Kjetil Orbekk <kj@orbekk.com>
Date: Mon, 22 Nov 2021 07:38:52 -0500
Subject: hamming solution

---
 exercism/emacs-lisp/hamming/hamming.el | 14 ++++++++++++++
 exercism/emacs-lisp/run-exercises.el   |  4 ++++
 2 files changed, 18 insertions(+)

diff --git a/exercism/emacs-lisp/hamming/hamming.el b/exercism/emacs-lisp/hamming/hamming.el
index 1ef5eeb..468ad63 100644
--- a/exercism/emacs-lisp/hamming/hamming.el
+++ b/exercism/emacs-lisp/hamming/hamming.el
@@ -4,6 +4,20 @@
 
 ;;; Code:
 
+(require 'cl-seq)
+(require 'cl-lib)
+
+(defun kj/sum (lst)
+  (cl-reduce #'+ lst :initial-value 0))
+
+(defun hamming-distance (l1 l2)
+  (when (not (eql (length l1) (length l2)))
+    (error 'lengths-differ))
+  (let ((fn (lambda (x y)
+              (if (equal x y)
+                  0
+                1))))
+    (kj/sum (cl-mapcar fn l1 l2))))
 
 (provide 'hamming)
 ;;; hamming.el ends here
diff --git a/exercism/emacs-lisp/run-exercises.el b/exercism/emacs-lisp/run-exercises.el
index 44831a6..39372e3 100644
--- a/exercism/emacs-lisp/run-exercises.el
+++ b/exercism/emacs-lisp/run-exercises.el
@@ -51,4 +51,8 @@
 (kj-display "Roman numerals"
             (to-roman 1990))
 
+(load-file "hamming/hamming.el")
+(kj-display "Hamming distance"
+            (hamming-distance "GGACGGATTCTG" "AGGACGGATTCT"))
+
 (provide 'hello)
-- 
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