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Nice. I've managed to knock off twelve characters though...

  • @_[0] can be replaced with pop. This needs whitespace before it, but it's still shorter. Savings: 1 character.
  • eq can be replaced by the smart match operator, allowing the whitespace around it to be dropped. Savings: 2 characters.
  • Semicolon after sub definition not needed. Savings: 1 character.

Now we've got:

perl -E'sub w{join"",sort pop=~/./g}$w=w pop;($w~~w$_)&&print for<>' . +/dict.txt acert

But, hell, we can go shorter. Let's switch from the join"",... construct with the babycart operator inside an interpolated string... "@{[...]}". Can't remember why I did this - doesn't actually reduce the size of the code, but I think it was necessary for some of the later stuff.

perl -E'sub w{"@{[sort pop=~/./g]}"}$w=w pop;($w~~w$_)&&print for<>' . +/dict.txt acert

Next, we stop passing a parameter to the w function, and use $_ instead. This means that we can take advantage of the fact that regular expressions get applied to $_ by default, giving us massive savings inside the function. Outside the function it's a mixed blessing. We need to assign that pop to $_ giving us a whole new statement. But we don't need to pass anything to w on either of its invocations, and we can drop the parentheses around the smart match comparison.

perl -E'sub w{"@{[sort/./g]}"}$_=pop;$w=w;$w~~w&&print for<>' ./dict.t +xt acert

Those two assignments in the middle started to grind my gears. I figured there must be a way to ditch the semicolon between them... and there is! The w function no longer cares about what parameters it's passed.

perl -E'sub w{"@{[sort/./g]}"}$w=w$_=pop;$w~~w&&print for<>' ./dict.tx +t acert

I could go two characters shorter, but only swapping from print to say which adds unsightly blank lines to the output.

UPDATE: five characters more. Smart match can deal with arrayrefs!

perl -E'sub w{[sort/./g]}$w=w$_=pop;$w~~w&&print for<>' ./dict.txt ace +rt
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In reply to Re^2: Perl Golf idea by tobyink
in thread Perl Golf idea by sweepy838

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