I have been aware that you can make it faster that way, but I usually don't. All that extra typing hurts my fingers :-)

No not really, but I like to keep oneliners short -- they have a nasty habit of hitting the right margin once what I do gets complicated -- and if I ever care about the performance of a oneliner, chances are it is getting complicated.

Having said that, it occurs to me that you might get the best of both worlds with a slightly different idiom. Compare:

perl -ne'print unless $seen{$_}++'
perl -ne'$seen{$_}++, print unless $seen{$_}'
perl -ne'$seen{$_}||=(print,1)'

[download]

Hey! It's even shorter than the original! We may be onto something here ... or maybe I have just been golfing too much lately ... :-)

Update: Juerd writes for oneliners, I think it's safe to assume print will print succesfully. Well ... I guess it is a good thing you have not seen my one-liners then. But okay, safe or not, it certainly is reasonable. It's not your fault that I am neither :-)

The Sidhekin
print "Just another Perl ${\(trickster and hacker)},"

In reply to Re: Re: Better "uniq" idiom? by Sidhekin
in thread Better "uniq" idiom? by RMGir

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