So its the calling of first that gives you nil
here is some example code
user=> (rest '(2))
()
user=> (rest '())
()
user=> (first '())
nil
2010/6/7 patrik karlin <patrik.kar...@gmail.com>:
> calling rest dosent give you nil it gives you an empty seq
> so the if statment never fails
>
> try
>
> (defn my-zipmap [keys vals]
> (loop [my-map {}
> [kf & kr] (seq keys)
> [vf & vr] (seq vals)]
> (if (and kf vf)
> (recur (assoc my-map kf vf) kr vr)
> my-map)))
>
>
>
> 2010/6/6 Jon Seltzer <seltzer1...@gmail.com>:
>> I'm still learning Clojure and doing so by reading everything on
>> clojure.org. I ran across this example in the Functional Programming
>> section:
>>
>> (defn my-zipmap [keys vals]
>> (loop [my-map {}
>> my-keys (seq keys)
>> my-vals (seq vals)]
>> (if (and my-keys my-vals)
>> (recur (assoc my-map (first my-keys) (first my-vals))
>> (rest my-keys)
>> (rest my-vals))
>> my-map)))
>>
>> (my-zipmap [:a :b :c] [1 2 3])
>>
>> However, when run, it hangs.
>>
>> I'm running:
>>
>> OS: Windows Vista - Business Edition
>> Java: 1.6.0_20
>>
>> If I had to guess, I'd say it's in an infinite loop, but not sure
>> what's wrong exactly.
>>
>> --
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>
>
>
> --
> ------------------------------------------------
> Nick: Korre
> Email: patrik.kar...@gmail.com
> ------------------------------------------------
>
--
------------------------------------------------
Nick: Korre
Email: patrik.kar...@gmail.com
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