2014-07-09 17:03 GMT+02:00 Thomas Heller <[email protected]>:
> Short and simple answer: NullPointerException
>
> (def object-locations nil)
>
> (object-locations 'bucket) will throw
> ('bucket object-locations) => nil
>
That is interesting.
Not a problem, because it will never be nil, but always a HashMap. But
better save as sorry. I will change it.
> 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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