I'm starting to read the Little Schemer and now instead of PLT Scheme we have Racket. I would like to know if Racket is suitable for doing the exercises in the book or do I need to get another true Scheme compiler. Before I forgot to tell you, my OS is Windows x64.
The book, language and paradigm is complex enough, I would love to avoid struggling with a compiler.
Thanks a lot in advance.
DrRacket is the (r)evolution of DrScheme; DrRacket will work perfectly for the exercises in "The Little Schemer". Just don't forget to:
- In the
Language
dialog, choose "Use the language declared in the source" - Write
#lang racket
at the top of each file you create - Implement the
atom?
predicate in each file as explained at the very beginning of the book - If you're going to re-implement an existing procedure, do so in a separate tab or window, because trying to rewrite a procedure in the edit window will result in a
duplicate definition for identifier
error. If necessary, use several files for saving the procedure definitions
I have had the author of the book as a professor. He now uses Racket himself, but he uses Emacs as a text editor.
You really just need the atom?
function. What’s described in the book's preface is essentially:
(define (atom? x)
(and (not (pair? x)) (not (null? x))))
As mentioned, it should satisfy this test:
(atom? '()) ;=> #f
Note that there is also a definition in Racklog that will not satisfy that test.
A more detailed discussion on atom?
is here.
Despite the book's suggestion to implement add1
and sub1
, Racket does already provide them.
BTW, I use Vim for editing Racket, but a few other editors are capable.
Racket/Scheme are interchangeable. You should be able to answer any exercise with it. Good luck.
Also, I recommend downloading Dr. Racket as your interpreter.
来源:https://stackoverflow.com/questions/13003850/little-schemer-and-racket