Thanks a lot Marko :) On Friday, March 22, 2013 12:44:06 PM UTC+2, Marko Topolnik wrote: > > Let's assume that key-fn is defined as #(.getID %) so we have: > >> >> #(keyset-b #(.getID %)) >> >> And now let's assume that item-object is passed to it. So, #(.getID %) >> returns, >> let's say, the number 3 (which is the value of the id). How exactly is that >> number is being looked up in keyset-b? How does keyset-b knows we are >> looking for an item with key id and value 3? >> > > Well, as its name already indicates, te keyset contains the keys. So it > will literally contain that 3 as its member. > > -marko >
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