Kevin Kleinfelter <kleinfelter.gro...@gmail.com> writes:
> I'm stumped by the behavior of the following code fragment. Can someone
> help me understand what's happening?
>
> *This code*:
> (println "Holding:" (:class holding))
> (let [t (:class holding)]
> (for [x t] (println "here" x))
> (for [x t] (println "there" x))))
>
> *Produces this output*:
> holding: {:fundname Mutual Fund 1, :value 123.45, :class [{:class sell-me,
> :percent 100}]}
> class: [{:class sell-me, :percent 100}]
> Holding: [{:class sell-me, :percent 100}]
> there {:class sell-me, :percent 100}
>
> Why doesn't the 'for' with "here" print anything?
'for' is lazy. the result isn't realized anywhere. the second 'for' is
realized because you print the result in the REPL (at least that is what
I assume).
try (doseq [x t] ...)
--
Cheers,
Ralf
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