Namespaced keywords in metadata
I've been writing some code which adds some keywords in metadata associated to vars. Initially I used namespaces keywords to not collide with other keywords. The problem is that having to namespace these keywords makes the code, at least, ugly. Is it any consensus in the use of keywords in metadata? I've done some search of examples and, most of them, does not use namespaced keywords, but I am not sure. Thanks, Juan Manuel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Namespaced keywords in metadata
I would recommend sticking with namespaced keywords to avoid clashes with var metadata keys. Remember qualified keywords respect namespace aliasing and ::keyword is qualified in the current namespace. These can help making the code more readable. You could store keywords in vars if namespaced keywords really bothered you. (def mykey ::mykey) Thanks, Ambrose On Wed, Dec 28, 2011 at 5:54 PM, JuanManuel Gimeno Illa jmgim...@gmail.comwrote: I've been writing some code which adds some keywords in metadata associated to vars. Initially I used namespaces keywords to not collide with other keywords. The problem is that having to namespace these keywords makes the code, at least, ugly. Is it any consensus in the use of keywords in metadata? I've done some search of examples and, most of them, does not use namespaced keywords, but I am not sure. Thanks, Juan Manuel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Namespaced keywords in metadata
El miércoles 28 de diciembre de 2011 11:01:16 UTC+1, Ambrose Bonnaire-Sergeant escribió: I would recommend sticking with namespaced keywords to avoid clashes with var metadata keys. Remember qualified keywords respect namespace aliasing and ::keyword is qualified in the current namespace. These can help making the code more readable. OK You could store keywords in vars if namespaced keywords really bothered you. (def mykey ::mykey) My main concern is that when using reader macros for metadata I have to fully qualify it. For instance, I must write: (defdatatype ::Streams Nil (^:ml.datatypes/lazy Cons elem stream)) instead of (defdatatype ::Streams Nil (^:lazy Cons elem stream)) But I suppose the benefits of namespacing outweight these inconveniences. Thanks, Juan Manuel Thanks, Ambrose On Wed, Dec 28, 2011 at 5:54 PM, JuanManuel Gimeno Illa jmgi...@gmail.com wrote: I've been writing some code which adds some keywords in metadata associated to vars. Initially I used namespaces keywords to not collide with other keywords. The problem is that having to namespace these keywords makes the code, at least, ugly. Is it any consensus in the use of keywords in metadata? I've done some search of examples and, most of them, does not use namespaced keywords, but I am not sure. Thanks, Juan Manuel -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Namespaced keywords in metadata
Hi,
Am 28.12.2011 um 11:09 schrieb JuanManuel Gimeno Illa:
My main concern is that when using reader macros for metadata I have to fully
qualify it. For instance, I must write:
(defdatatype
::Streams
Nil
(^:ml.datatypes/lazy Cons elem stream))
instead of
(defdatatype
::Streams
Nil
(^:lazy Cons elem stream))
But I suppose the benefits of namespacing outweight these inconveniences.
Please consider the alternatives outlined by Ambrose:
user= (require '[clojure.string :as str])
nil
user= (meta ^:foo [])
{:foo true}
user= (meta ^::foo [])
{:user/foo true}
user= (meta ^::str/foo [])
{:clojure.string/foo true}
Sincerely
Meikel
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Re: Namespaced keywords in metadata
Finally I have considered your advice and namespaced the keywords.
Thanks,
Juan Manuel
El miércoles 28 de diciembre de 2011 12:33:22 UTC+1, Meikel Brandmeyer
(kotarak) escribió:
Hi,
Am 28.12.2011 um 11:09 schrieb JuanManuel Gimeno Illa:
My main concern is that when using reader macros for metadata I have to
fully qualify it. For instance, I must write:
(defdatatype
::Streams
Nil
(^:ml.datatypes/lazy Cons elem stream))
instead of
(defdatatype
::Streams
Nil
(^:lazy Cons elem stream))
But I suppose the benefits of namespacing outweight these inconveniences.
Please consider the alternatives outlined by Ambrose:
user= (require '[clojure.string :as str])
nil
user= (meta ^:foo [])
{:foo true}
user= (meta ^::foo [])
{:user/foo true}
user= (meta ^::str/foo [])
{:clojure.string/foo true}
Sincerely
Meikel
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