No, set! mutates variable bindings while set-car! mutates cons cells (the first slot of a data structure).
On Mar 5, 2014, at 1:13 PM, Daniel Carrera wrote: > Hello, > > My understanding is that Racket intentionally does not provide set-car! and > set-cdr! and that this is one of the ways in which Racket is not fully > compatible with Scheme. > > Am I right to think that it is trivially easy to add these features to > Racket? Specifically, I'm thinking of: > > > (define-syntax set-car! > (syntax-rules () > ((_ l new_car) (set! l (cons new_car (cdr l)))))) > > (define-syntax set-cdr! > (syntax-rules () > ((_ l new_cdr) (set! l (cons (car l) new_cdr))))) > > > Or did I miss something? > > Cheers, > Daniel. > -- > When an engineer says that something can't be done, it's a code phrase that > means it's not fun to do. > ____________________ > Racket Users list: > http://lists.racket-lang.org/users ____________________ Racket Users list: http://lists.racket-lang.org/users
