Re: Re: state preserving uniq

And that can be sped up even more...

perl -ne 'print if 1 == ++$s{lc $_}'
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(The difference is that you don't have to create temporary variables.)

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Re: Re: Re: state preserving uniq by xmath (Hermit) on Mar 01, 2003 at 16:22 UTC
Although I can't test it right now, I sincerely doubt that your version is faster, especially if you compare the optrees: Read more... (2 kB) While your version does save copying the old integer value to a temporary (you realize the temporary sv is allocated at compile-time, right?), it takes two extra ops, which I'm pretty sure costs more cpu time. And in any case the difference is too minimal (especially compared to lowercasing the string and doing a hash lookup) to justify adding to the code complexity	[reply] [d/l] [select]

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Re: Re: Re: state preserving uniq
by xmath (Hermit) on Mar 01, 2003 at 16:22 UTC

Read more... (2 kB)

While your version does save copying the old integer value to a temporary (you realize the temporary sv is allocated at compile-time, right?), it takes two extra ops, which I'm pretty sure costs more cpu time.

And in any case the difference is too minimal (especially compared to lowercasing the string and doing a hash lookup) to justify adding to the code complexity

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