Hi Colin,
Have a look at the 'as->' macro, its very helpful in some cases, as:
(-> []
(conj some-element)
(as-> some-seq
(if some-condition? (conj some-seq some-element) some-seq)
(if some-other-condition? (conj some-seq some-other-element)
some-seq))
(take some-number-of-elements))
Dňa streda, 21. mája 2014 18:23:06 UTC+2 Colin Yates napísal(-a):
>
> I often find myself doing the following:
>
> (let [some-seq []
> some_seq (if some-condition? (conj some-seq some-element) some-seq)
> some_seq (if some-other-condition? (conj some-seq
> some-other-element) some-seq)
> some_seq etc.])
>
> In other words building up a sequence which contains the results of
> predicated elements. Building up a where clause in SQL for example.
>
> I experimented with the -> and ->> but that didn't help and just looked
> messier.
>
> How do you handle this pretty common use case?
>
> Thanks!
>
>
>
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