Tools for parsing arguments
Is there anything in core or contrib for parsing arguments to a function? Since Clojure fns don't support optional args or even keyword args, is there a standard set of helpers functions to do this? I looked around but I didn't see anything obvious. David --~--~-~--~~~---~--~~ 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 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: Tools for parsing arguments
On Feb 6, 10:06 am, David Nolen wrote: > Is there anything in core or contrib for parsing arguments to a > function? Since Clojure fns don't support optional args or even keyword > args, is there a standard set of helpers functions to do this? I looked > around but I didn't see anything obvious. No, but there is a pattern for keyword args: (defn my-function [& args] (let [options (apply hash-map args)] ...)) Then you can call (my-function :keyword value :keyword2 value). -Stuart Sierra --~--~-~--~~~---~--~~ 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 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: Tools for parsing arguments
That is remarkably simple and elegant. On Fri, Feb 6, 2009 at 10:20 AM, Stuart Sierra wrote: > > On Feb 6, 10:06 am, David Nolen wrote: > > Is there anything in core or contrib for parsing arguments to a > > function? Since Clojure fns don't support optional args or even keyword > > args, is there a standard set of helpers functions to do this? I looked > > around but I didn't see anything obvious. > > No, but there is a pattern for keyword args: > > (defn my-function [& args] > (let [options (apply hash-map args)] >...)) > > Then you can call (my-function :keyword value :keyword2 value). > > -Stuart Sierra > > > --~--~-~--~~~---~--~~ 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 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: Tools for parsing arguments
you can also use map destructuring.
(defn x [{:keys [a b c]}]
[a b c])
user=> (x {:a 1 :b 2 :c 3})
[1 2 3]
On Fri, Feb 6, 2009 at 7:52 AM, Jeffrey Straszheim
wrote:
> That is remarkably simple and elegant.
>
> On Fri, Feb 6, 2009 at 10:20 AM, Stuart Sierra
> wrote:
>>
>> On Feb 6, 10:06 am, David Nolen wrote:
>> > Is there anything in core or contrib for parsing arguments to a
>> > function? Since Clojure fns don't support optional args or even keyword
>> > args, is there a standard set of helpers functions to do this? I looked
>> > around but I didn't see anything obvious.
>>
>> No, but there is a pattern for keyword args:
>>
>> (defn my-function [& args]
>> (let [options (apply hash-map args)]
>>...))
>>
>> Then you can call (my-function :keyword value :keyword2 value).
>>
>> -Stuart Sierra
>>
>
>
> >
>
--
And what is good, Phaedrus,
And what is not good—
Need we ask anyone to tell us these things?
--~--~-~--~~~---~--~~
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
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: Tools for parsing arguments
Stuart Sierra a écrit :
> No, but there is a pattern for keyword args:
>
> (defn my-function [& args]
> (let [options (apply hash-map args)]
> ...))
>
> Then you can call (my-function :keyword value :keyword2 value)
And you can use destructuring to add support for defaults value:
(defn my-function [& args]
(let [{:keys [option1 option2] :or {option1 "default1" option2 "default2"}}
(apply hash-map args)]
...))
Christophe
--
Professional: http://cgrand.net/ (fr)
On Clojure: http://clj-me.blogspot.com/ (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
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: Tools for parsing arguments
Thanks all, Clojure list is the best.
On Fri, Feb 6, 2009 at 11:27 AM, Christophe Grand wrote:
>
> Stuart Sierra a écrit :
> > No, but there is a pattern for keyword args:
> >
> > (defn my-function [& args]
> > (let [options (apply hash-map args)]
> > ...))
> >
> > Then you can call (my-function :keyword value :keyword2 value)
> And you can use destructuring to add support for defaults value:
>
> (defn my-function [& args]
> (let [{:keys [option1 option2] :or {option1 "default1" option2
> "default2"}} (apply hash-map args)]
>...))
>
>
> Christophe
>
> --
> Professional: http://cgrand.net/ (fr)
> On Clojure: http://clj-me.blogspot.com/ (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
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: Tools for parsing arguments
Hi, There is also a defnk macro by Rich, which allows easy definition of keyword args for functions. http://paste.lisp.org/display/69347 Sincerely Meikel smime.p7s Description: S/MIME cryptographic signature
