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Re^3: Finding oldest file in directory

by theorbtwo (Prior)
on Oct 19, 2004 at 13:16 UTC ( #400505=note: print w/replies, xml ) Need Help??


in reply to •Re^2: Finding oldest file in directory
in thread Finding oldest file in directory

Note that the arguments against a perl-based high-water-mark algorithm don't apply to List::Util::max, which, like sort, is written in C. (The overhead of a function call vs the overhead of other opcodes does, however, apply, but that's a very small difference.)

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•Re^4: Finding oldest file in directory
by merlyn (Sage) on Oct 19, 2004 at 13:22 UTC
    Yes, I was talking about builtin Perl sort vs a Perl-coded high-water mark. Your List::Util's max doesn't apply in the referenced case (largest file), because max can't be coaxed to doing an indirection, so you'd need a GRT style translation, or else you're back to open coding it, again.

    The point here is that high-water-mark is one strategy, and sorting is another strategy, with different costs depending on the length. The only real takeaway here is Benchmark will know, because you can't always guess.

    -- Randal L. Schwartz, Perl hacker
    Be sure to read my standard disclaimer if this is a reply.

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[thepkd]: Hi, in trying to create an Array of Hash of Array of Hash. You read it right. Is it possible to dereference it without using temps?
[GotToBTru]: what are temps?
[GotToBTru]: you can always have ${${${$array[0]}{ key1}}[1]}{key2}
[GotToBTru]: I think I have that inside out .. but you get the point
[choroba]: $array[0]{key1}[1] {key2}
[thepkd]: ??
[GotToBTru]: I would think temporary variables would help in making the real life meaning of your structure clear
[choroba]: the problems start when you want to "skip a level", i.e. the arrays for all the keys

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