simplified code

day01-easy/main.scm

@@ -16,6 +16,12 @@
     '()
     (cons (mapper (car list)) (map (cdr list) mapper))))
 
+(define (reduce list reducer current)
+  (if
+    (null? list)
+    current
+    (reduce (cdr list) reducer (reducer current (car list)))))
+
 (define (first-last-combine current rest)
   (if
     (null? current)
@@ -36,26 +42,16 @@
         '())
       (first-last (cdr list) predicate))))
 
-(define (sum numbers)
-  (if
-    (null? numbers)
-      0
-      (+ (car numbers) (sum (cdr numbers)))
-      ))
+(define (sum numbers) (reduce numbers + 0))
 
 (define (solve-line line)
   (
-    #!(lambda (first-last-result) (sum (map first-last-result (lambda (char) (string->number (string char))))))!#
     (lambda (first-last-result) (string->number (list->string first-last-result)))
     (first-last
       (string->list line)
       (lambda (char) (if (char-numeric? char) #t #f)))))
 
 (define (solve-all lines)
-  (if
-    (null? lines)
-    0
-    (+ (solve-line (car lines)) (solve-all (cdr lines)))
-    ))
+  (sum (map lines solve-line)))
 
 (display (solve-all (read-lines)))