On Sep 30, 2010, at 2:53 AM, Baishampayan Ghose wrote:
>> I have a need to convert maps in the following ways:
>>
>> Given a map with keyword keys, I need a map with uppercase string keys
>> - and vice versa.
>>
>> { :stuff 42 :like 13 :this 7 } <=> { "STUFF" 42 "LIKE" 13 "THIS" 7 }
>
> What about this -
>
> (into {} (for [[k v] { :stuff 42 :like 13 :this 7 }]
> [(.toUpperCase (name k)) v]))
>
One small suggestion based on something Christophe Grand once pointed out:
(defn string-keys [m]
(into (empty m) (for [[k v] m] [(.toUpperCase (name k)) v])))
(defn keyword-keys [m]
(into (empty m) (for [[k v] m] [(keyword (.toLowerCase k)) v])))
This will preserve the type of the map.
(string-keys { :stuff 42 :like 13 :this 7 } ) => {"THIS" 7, "LIKE" 13, "STUFF"
42}
(keyword-keys (string-keys { :stuff 42 :like 13 :this 7 } )) => {:stuff 42,
:like 13, :this 7}
Have all good days,
David Sletten
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