Re^2: Flip-flop won't DWIM


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by wu-lee (Beadle)

on May 21, 2009 at 15:58 UTC ( #765487=note: print w/replies, xml )

Need Help??

Right. Of course, silly me.

Ok, so this does what I want:

perl -lwe '$x = 1; print join " ", grep { scalar($x++../D/) } qw(A B C
+ D E F)'
# prints:
# A B C D
[download]

Although this is not particularly neat. Is there a better way?

Comment on Re^2: Flip-flop won't DWIM Download Code

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Re^3: Flip-flop won't DWIM by akho (Hermit) on May 21, 2009 at 16:15 UTC
Your code prints "A B C D E F" for me, and I cannot see why it would print anything else. This seems to work if you insist on using flip-flop: `$x = 1; print join " ", grep { $x..(($x=0) or /D/) } qw(A B C D E F);` [download] However, you could copy stuff from List::MoreUtils.	[reply] [d/l]
Re^3: Flip-flop won't DWIM by wu-lee (Beadle) on May 21, 2009 at 16:13 UTC
Actually, that doesn't, but this does: `perl -lwe '$x = 0; print join " ", grep { scalar(!$x++../D/) } qw(A B + C D E F)' # prints: # A B C D` [download]	[reply] [d/l]
Re^3: Flip-flop won't DWIM by ikegami (Patriarch) on May 21, 2009 at 16:57 UTC
The "++" does nothing.	[reply]

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