Re: Idiomatic sub-hashmap

2009-02-13 Thread Timothy Pratley 

Yup: select-keys

user= (select-keys {:a 1 :b 2 :c 3} [:a :c])
{:c 3, :a 1}

Regards,
Tim.

On Feb 13, 8:01 pm, Adrian Cuthbertson adrian.cuthbert...@gmail.com
wrote:
 Hi,

 I have had need of a sub hash map function and implemented it as follows;

 (defn sub-hashmap
 Return a sub map of hmap containing the specified keys.
  [hmap  ks]
 (reduce (fn [mm k] (assoc mm k (k hmap))) {} ks))

 (sub-hashmap {:a 1 :b 2 :c 3} :a :c)
 ;= {:c 3, :a 1}

 Is there a similar existing function or a more idiomatic way of doing this?

 Thanks, Adrian.
--~--~-~--~~~---~--~~
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: Idiomatic sub-hashmap

2009-02-13 Thread Adrian Cuthbertson 

Thanks!

On Fri, Feb 13, 2009 at 1:28 PM, Timothy Pratley
timothyprat...@gmail.com wrote:

 Yup: select-keys

 user= (select-keys {:a 1 :b 2 :c 3} [:a :c])
 {:c 3, :a 1}

 Regards,
 Tim.

 On Feb 13, 8:01 pm, Adrian Cuthbertson adrian.cuthbert...@gmail.com
 wrote:
 Hi,

 I have had need of a sub hash map function and implemented it as follows;

 (defn sub-hashmap
 Return a sub map of hmap containing the specified keys.
  [hmap  ks]
 (reduce (fn [mm k] (assoc mm k (k hmap))) {} ks))

 (sub-hashmap {:a 1 :b 2 :c 3} :a :c)
 ;= {:c 3, :a 1}

 Is there a similar existing function or a more idiomatic way of doing this?

 Thanks, Adrian.
 


--~--~-~--~~~---~--~~
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
-~--~~~~--~~--~--~---