On May 3, 2014, at 6:42 AM, Roelof Wobben <[email protected]> wrote:
>
> (fn [default initial-keys]
> (loop [remaining-keys initial-keys
> result-map {}]
> (if (empty? remaining-keys)
> result-map
> (let [key (first remaining-keys)
> remaining-keys' (rest remaining-keys)
> result-map' (assoc result-map key default)]
> (recur remaining-keys' result-map')))))
>
> This also passes the unit tests.
>
> Maybe that's a bit clearer as to what's going on. Maybe the new names help a
> bit. Notice the ticks on some of the names (the ' characters). This is just a
> convention some programmers use. The ticks are part of the name, nothing
> magic, and are used to indicate that the value of the name is derived from
> the value of the name with one less tick. Some programmers use numbers
> instead. Other programmers don't care and just use the same name.
>
> When you've understood the solution you've come up with, you might want to
> try using reduce to do this. It'll be both shorter and much easier to
> understand. If you look carefully at your code the only part that isn't
> boiler-plate is the (assoc result-map key default) -- the boiler-plate
> corresponds closely to what reduce does.
>
>
> Thanks,
>
> Now It more clearer what loop does.
> I can look at a reduce solution but then I have to look which reduce I have
> to use.
> I know reduce + and reduce - which does calculations on the collection.
This reduce: http://clojuredocs.org/clojure_core/clojure.core/reduce is what
you need.
Cheers,
Bob
>
> Roelof
>
>
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