#racket on 2022-11-09 — irc logs at libera.irclog.whitequark.org

2022-05-25 08:19 tonyg changed the topic of #racket to: The Racket Programming Language -- https://racket-lang.org/ -- https://gather.town/app/wH1EDG3McffLjrs0/racket-users -- http://pasterack.org -- logged at https://libera.irclog.whitequark.org/racket/ -- This is the right place to ask for help with (Dr)Racket. Remember to wait around for an answer!

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15:22 <random-jellyfish> can somebody explain to me in simple words why we need syntax objects? why can't we use just quoted expressions?

15:33 <samth> random-jellyfish: syntax objects contain metadata about the term, most significantly _binding information_. That way, if a macro expands to `(if a b c)` then `if` means what it did when the macro was defined.

15:34 <samth> syntax objects also have other kinds of metadata, like source locations (important for error messages) or other properties used by various tools and macros

16:53 <random-jellyfish> thanks!

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17:56 <winny> rudybot: eval #t

17:56 <rudybot> winny: your sandbox is ready

17:56 <rudybot> winny: ; Value: #t

17:57 <winny> rudybot: eval (match 1234 [list? 'foo] [_ 'bar]) ; jboy

17:57 <rudybot> winny: ; Value: 'foo

17:57 <winny> rudybot: eval (match 1234 [(? list?) 'foo] [_ 'bar])

17:57 <rudybot> winny: ; Value: 'bar

17:58 <winny> rudybot: eval (match (list 1 2 3 4) [(? list?) 'foo] [_ 'bar])

17:58 <rudybot> winny: ; Value: 'foo

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