Re: Perl Golf idea

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Re^2: Perl Golf idea by tobyink (Canon) on Apr 30, 2012 at 22:51 UTC
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$_)&&print for<>' . +/dict.txt acert` [download] But, hell, we can go shorter. Let's switch from the `join"",...` construct with the babycart operator inside an interpolated string... `"@{[...]}"`. Can't remember why I did this - doesn't actually reduce the size of the code, but I think it was necessary for some of the later stuff. `perl -E'sub w{"@{[sort pop=~/./g]}"}$w=w pop;($w~~w$_)&&print for<>' . +/dict.txt acert` [download] 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;$w~~w&&print for<>' ./dict.t +xt acert` [download] Those two assignments in the middle started to grind my gears. I figured there must be a way to ditch the semicolon between them... and there is! The `w` function no longer cares about what parameters it's passed. `perl -E'sub w{"@{[sort/./g]}"}$w=w$_=pop;$w~~w&&print for<>' ./dict.tx +t acert` [download] 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;$w~~w&&print for<>' ./dict.txt ace +rt` [download] `perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'`	[reply] [d/l] [select]
Re^3: Perl Golf idea by JavaFan (Canon) on May 01, 2012 at 14:57 UTC
One character less: `perl -nlE'sub w{[sort/./g]}INIT{$w=w$_=pop}$w~~w&&say' ./dict.txt acer +t` [download] And if you don't mind the (second) argument getting printed, another 3 chars less: `perl -nlE'sub w{[sort/./g]}$w\|\|=w$_=pop;$w~~w&&say' ./dict.txt acert` [download]	[reply] [d/l] [select]
Re^4: Perl Golf idea by brx (Pilgrim) on May 01, 2012 at 20:58 UTC
And if you don't mind the (second) argument getting printed, another 3 chars less: `perl -nlE'sub w{[sort/./g]}$w\|\|=w$_=pop;$w~~w&&say' ./dict.txt acert` This one is wrong (only) if the first line of 'dict.txt' contains a valid word (different from arg2). example: `$ cat dict.txt one neo noe bad $ perl -nlE'sub w{[sort/./g]}$w\|\|=w$_=pop;$w~~w&&say' ./dict.txt oen oen neo noe` [download] First word is missing. Anyway, this is a very beautiful version: ++ UPDATE: with an extra newline `perl -E'@a=sort pop=~/./g;say grep@a~~[sort/./g],<>' ./dict.txt acert` UPDATE2: one char useless `perl -E'@a=sort pop=~/./g;say grep@a~~[sort//g],<>' ./dict.txt acert`	[reply] [d/l] [select]
Re^5: Perl Golf idea by thundergnat (Deacon) on May 02, 2012 at 17:08 UTC
Re^3: Perl Golf idea by thundergnat (Deacon) on May 01, 2012 at 14:09 UTC
Umm. Wow. I knew there was room for ~~improvement~~ reduction but... tobyink++	[reply]


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