On Tue, May 26, 2009 at 06:43:40PM -0500, John M. Dlugosz wrote:
> Daniel Carrera daniel.carrera-at-theingots.org |Perl 6| wrote:
>> The following construction doesn't do what a user might expect:
>>
>> for 0...@foo.elems -> $k { do_something($k,@foo[$k]) }
>
> Write ^...@foo.elems as a shortcut of 0...@foo.elems, which is the
> variation to exclude that endpoint if you would rather not write
> 0...@foo.elems-1.
An even cleaner shortcut might be to use ^...@foo instead of ^...@foo.elems:
for ^...@foo -> $k { do_something($k, @foo[$k]) }
Somewhat clearer could be:
for @foo.keys -> $k { do_something($k, @foo[$k]) }
And some may prefer:
for @foo.kv -> $k, $v { do_something($k, $v) }
I think the anti-pattern of "0...@foo.elems" (or its incorrect
form "0...@foo.elems") should probably disappear in favor of
the above forms instead.
Pm
