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Re: List::MoreUtils before, after and ... between?

by tobyink (Abbot)
on Feb 21, 2012 at 18:11 UTC ( #955365=note: print w/replies, xml ) Need Help??

in reply to List::MoreUtils before, after and ... between?

No good for one-liners, but this looks pretty sweet:

use 5.010; use strict; use List::MoreUtils qw/first_index last_index/; sub narrow { my ($from, $to) = map { $_->(@_) } @{(pop)}; return @_[$from .. $to]; } sub from (&$) { [ @_[0..1] ] } sub to (&) { $_[0] } my @list = qw/eval DBIC::1 DBIC::2 My::1 My::2 My::3 Dancer::1 Dancer: +:2 Dancer::3 Dancer::4/; say foreach narrow @list, from { 1 + last_index { /^DBIC/ } @_ } to { (-1) + first_index { /^Dancer/ } @_ };

Obviously you'd want to factor narrow, from and to out into a separate module rather than defining them inline.

And given that from and to are quite generic names, perhaps something like start_at and finish_at might be better in practice.

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