Hi Tim,
On 11/18/2016 2:20 PM, Tim Johnson wrote:
Hello racketeers :
I retired as a coder. Now I can write in whatever programming
language I wish to.
I'd like to learn racket. I intend to start by working off of the
Schemer books. I have the first three.
Is racket fully compatible to the code in the schemer books?
If not, is there a site that would detail any incompatibilities?
Thanks
I don't think there is any definitive list of incompatibilities.
The biggest is that Racket has immutable list pairs (cons cells). In the
module language (#lang racket), set-car! and set-cdr! are not defined.
There is a separate mutable pair type, mcons, that can be used instead.
The R_RS languages (e.g., #lang r5rs, #lang r6rs) alias cons, set-car!
and set-cdr! to the mutable mcons type. You can use lists/pairs
normally in R_RS code, but if you try to examine a list in the REPL you
will see the difference: e.g.
#lang r5rs
(define p (list 'a 'b))
=> p
(mcons 'a (mcons 'b '()))
=>
If you're working from a Scheme book, you probably should start with
R5RS (#lang r5rs).
But see:
https://docs.racket-lang.org/r5rs/index.html?q=r5rs
https://docs.racket-lang.org/reference/pairs.html?q=pairs
https://docs.racket-lang.org/reference/mpairs.html?q=pairs
George
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