Thanks a lot Marko. Much better now :)
I also wanted to ask you why did you mention in a previous post that you
prefer using *remove *than *filter + complement*. Is there a reason for
this or just a personal preference?
Ryan
On Thursday, March 21, 2013 5:37:33 PM UTC+2, Marko Topolnik wrote:
>
> First we build a set of all the keys in *list-b*:
>
> (into #{} (map key-fn list-b))
>
> Let's call that set *keyset-b. *Then we use *keyset-b* as a function
> which returns truthy (non-nil) for any key that is contained in it, and
> compose it with our *key-fn*:
>
> (comp keyset-b key-fn)
>
> This results in a function that first applies *key-fn*, then *keyset-b*.
> So it's like #(keyset-b (key-fn %)). Let's call this function *predicate*.
>
> Finally, we use *predicate* to *remove* any member of *list-a* for which
> it is truthy:
>
> (remove predicate list-a)
>
> -marko
>
> On Thursday, March 21, 2013 4:14:46 PM UTC+1, Ryan wrote:
>
>> Marko,
>>
>> Can you please do me a favor and break down the function you suggested
>> me? I understand partially how it works but I am having trouble to fully
>> get it.
>>
>> (remove (comp (into #{} (map key-fn list-b)) key-fn) list-a)
>>>
>>
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