svn: r14689

collects/lang/private/TODO

@@ -0,0 +1,41 @@
+If we eliminate char from HtDP/I, we need to add re-think the following
+functions: 
+
+integer->char -- 1string version 
+
+char->integer -- 1string version
+
+string->list -- explode 
+
+list->string -- implode 
+
+char-numeric?  -- in a sense string->number is enough
+ (number? (string->number s))
+
+char-alphabetic?  -- 
+ (andmap (lambda (c) 
+           (or (string<=? "A" x "Z") (string<=? "a" x "z")))
+         (string->list s))
+
+char-whitespace?  -- (andmap char-whitespace? s)
+
+char-upper-case?  -- (string<=? "A" x "Z")
+
+char-lower-case?  -- (string<=? "a" x "z")
+
+char-upcase   string-upcase
+
+char-downcase string-downcase
+
+make-string : Nat Char -> String 
+ Nat String1 -> String 
+
+string      : Char ... -> String 
+ delete, string-append is enough 
+
+string-ref  : String Nat -> Char
+ ith
+
+NOTE: 
+substring consumes 2 or 3 arguments 
+