> Lisp hackers have been effortlessly reshaping the language for decades using the powerful macro system and extending and bending the language to their will. I've written a bit of Racket code ( https://github.com/evdubs?tab=repositories&q=&type=&language... ) and I still haven't written a macro. In only one case did I even think a macro would be useful: merging class member definitions to include both the type and t…
How do Lisp developers deal with XML and JSON? Convert it to s-expressions. As a common lisp developer, that is only very vaguely true for me. The mapping I prefer for json Lisp is: true: t false: nil null: :null [] #() {} (make-hash-table :test #'equal) This falls out of my desire for the mapping to be bijective: - The only built-in type that is unambiguously a mapping type is hash-tabe. - nil is the only value that…
true #t
false #f
null ()
[...] (& ...)
"k" : v (: k v)
{...} (@ ...)
($define! &
($lambda args (cons list args)))
($define! :
($vau (key value) env
(list key (eval value env))))
($define! @
(wrap
($vau kvpairs env
(eval (list* $bindings->environment kvpairs) env))))
($define! person
(@
(: first_name "John")
(: last_name "Smith")
(: is_alive #t)
(: age 27)
(: address
(@
(: street_address "21 2nd Street")
(: city "New York")
(: state "NY")
(: postal_code "10021-3100")))
(: phone_numbers
(& (@ (: type "home") (: number "212 555-1234"))
(@ (: type "office") (: number "646 555-4567"))))
(: children
(& "Catherine" "Thomas" "Trevor"))
(: spouse ())))
($define! ? $remote-eval)
> (? age person)
27
> (? postal_code (? address person))
"10021-3100"
> (car (? children person))
"Catherine"
> (cdr (? children person))
("Thomas" "Trevor")
> (? type (cadr (? phone_numbers person)))
"office"
> (? number (car (? phone_numbers person)))
"212 555-1234"
> ($define! full_name ($lambda (p) (string-append (? first_name p) " " (? last_name p))))
> (full_name person)
"John Smith"