On 13 March 2010 15:49, Glen Rubin <rubing...@gmail.com> wrote:
> If I try:
>
> (filter #(while (< % 20)) primes)
>
> It gets hung up since filter keeps testing primes, despite the fact
> that they have grown too large. So, I would like filter to stop at
> the first false result.
Actually that's not what happens. Execution never leaves the first
application of #(while (< % 20)), since it expands (performing
macro-expansion and substituting the concrete parameter for the formal
%) to
(loop []
(when (< 2 20)
(recur)))
See the docs on while (e.g. through (doc while) at the REPL) and its
source (e.g. through (c.c.repl-utils/source while) at the REPL).
Sincerely,
Michał
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