X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?a=blobdiff_plain;f=src%2Fscheme-library.scm;h=cd2693231759f24143b192baa22b34d6d06f2f99;hb=5c256a740ae9bf1f774e202cbdaf66d8e33f37e7;hp=14aa6f89d619553bc1c0e21c34db0633e1c31e22;hpb=2899e37fdb0ecf89bb949cfcc0a9db2cac54677f;p=scheme.forth.jl.git

diff --git a/src/scheme-library.scm b/src/scheme-library.scm
index 14aa6f8..cd26932 100644
--- a/src/scheme-library.scm
+++ b/src/scheme-library.scm
@@ -13,7 +13,27 @@
 (define (cdar l) (cdr (car l)))
 (define (cddr l) (cdr (cdr l)))
 (define (cadar l) (car (cdr (car l))))
+(define (caddr l) (car (cdr (cdr l))))
+(define (cadddr l) (car (cdr (cdr (cdr l)))))
 
+;; FUNCTIONAL PROGRAMMING
+
+(define (fold-left proc init l)
+  (if (null? l)
+    init
+    (fold-left proc (proc init (car l)) (cdr l))))
+
+(define (reduce-left proc init l)
+  (if (null? l)
+    init
+    (if (null? (cdr l))
+      (car l)
+      (fold-left proc (proc (car l) (car (cdr l))) (cdr (cdr l))))))
+
+(define (map proc l)
+  (if (null? l)
+    '()
+    (cons (proc (car l)) (map proc (cdr l)))))
 
 ;; NUMBERS
 
@@ -118,18 +138,6 @@
 (define (null? arg)
   (eq? arg '()))
 
-(define (fold-left proc init l)
-  (if (null? l)
-    init
-    (fold-left proc (proc init (car l)) (cdr l))))
-
-(define (reduce-left proc init l)
-  (if (null? l)
-    init
-    (if (null? (cdr l))
-      (car l)
-      (fold-left proc (proc (car l) (car (cdr l))) (cdr (cdr l))))))
-
 (define (+ . args)
   (fold-left pair+ 0 args))