2014-07-09 17:18 GMT+02:00 Thomas Heller <th.hel...@gmail.com>:
> Oh and its rare (outside of macros) to use symbols like that. Usually
> you'd use keywords.
>
> (def object-locations
> {:whiskey :living-room})
>
It is from 'Land of Lisp'. The symbols are printed. Or is it possible to
print the keyword without the :?
> On Wed, Jul 9, 2014 at 5:03 PM, Thomas Heller <th.hel...@gmail.com> wrote:
>
>> Short and simple answer: NullPointerException
>>
>> (def object-locations nil)
>>
>> (object-locations 'bucket) will throw
>> ('bucket object-locations) => nil
>>
>> HTH,
>> /thomas
>>
>> On Wednesday, July 9, 2014 3:48:53 PM UTC+2, Cecil Westerhof wrote:
>>>
>>> When you have:
>>> (def object-locations {
>>> 'whiskey 'living-room
>>> 'bucket 'living-room
>>> 'chain 'garden
>>> 'frog 'garden
>>> 'dummy 'nowhere
>>> 'test 'nowhere
>>> })
>>>
>>> You can retrieve the location of the bucket with:
>>> (object-locations 'bucket)
>>> and with:
>>> ('bucket object-locations)
>>>
>>> Personally I find the first better, but ‘Clojure Programming' uses the
>>> second possibility. What is the better way and why?
>>>
>>
--
Cecil Westerhof
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