On 18 March 2010 23:40, Michael Gardner <gardne...@gmail.com> wrote:
> On Mar 18, 2010, at 4:17 PM, David Nolen wrote:
>
>> On Thu, Mar 18, 2010 at 4:25 PM, alux <alu...@googlemail.com> wrote:
>> Hello!
>>
>> I much enjoyed reading the tutorial http://www.lisperati.com/casting.html
>> , mentioned by eyeris today. The most mind-extending thing (to me,
>> having Java background) is the, admittedly non-idiomatic, use of
>> symbols as data.
>>
>> But I have two translation problems, I want to pose before going to
>> sleep (its pitch dark in Europe :). First the easy one:
>>
>> Common Lisp
>> (defun describe-path (path)
>>  `(there is a ,(second path) going ,(first path) from here.))
>>
>> You probably want
>>
>> (defn describe-path [path]
>>    `(~'there ~'is ~'a ~(second path) ~'going ~(first path) ~'from ~'here))
>
> Or just:
>
> (defn describe-path [path]
>    ['there 'is 'a (second path) 'path 'going (first path) 'from 'here])
>
> But using symbols for something like this is a bit contrived anyway.

Maybe, but I've seen it in other Common Lisp books/tutorials before.
e.g. I'm sure PAIP was one of them.

-- 
Michael Wood <esiot...@gmail.com>

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