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Well, I think if you can avoid calling require over and over again, you should. Any require is at least a lookup in %INC each time you execute it.

use Benchmark qw(:hireswallclock timethese); timethese( 1000000,{ one => sub { require Benchmark }, two => sub { require Benchmark; require Benchmark }, }); __END__ $ perl 1 Benchmark: timing 1000000 iterations of one, two... one: 2.43888 wallclock secs ( 1.70 usr + 0.00 sys = 1.70 CPU) @ 588 +235.29/s (n=1000000) two: 5.11982 wallclock secs ( 2.77 usr + 0.00 sys = 2.77 CPU) @ 361 +010.83/s (n=1000000)

Also, for some reason your list flattening with map() does not work. Not sure whether this is a bug in Perl, or a conceptual problem with using map() and $_. Observe:

use Encode qw(_utf8_on); $a = [['']]; foreach (@$a) { _utf8_on($_) foreach @$_ } # my way print utf8::is_utf8( $a->[0][0] ),$/; $a = [['']]; _utf8_on( $_ ) for map @$_, @{$a}; # Aristotle's way print utf8::is_utf8( $a->[0][0] ),$/; __END__ 1
which should show two 1's instead of 1.

But also from a performance point of view, the extra list flattening with map() is not very efficient:

use Encode qw(_utf8_on); use Benchmark qw(:hireswallclock timethese); push @$a,[(0) x 10] foreach 1..10; timethese( 10000,{ liz => sub { foreach (@{$a}) { _utf8_on( $_ ) foreach @{$_}; } }, Aristotle => sub { _utf8_on( $_ ) for map @$_, @{$a}; }, }); __END__ Benchmark: timing 10000 iterations of Aristotle, liz... Aristotle: 4.37344 wallclock secs ( 3.73 usr + 0.00 sys = 3.73 CPU) @ + 2680.97/s (n=10000) liz: 4.06957 wallclock secs ( 2.73 usr + 0.00 sys = 2.73 CPU) @ 3663. +00/s (n=10000)


The way Aristotle proposed doesn't work because map() creates a copy of the elements, on which the UTF-8 flag is set and then discarded. See $_ and list flattening with map() for more info.

In reply to Re: Re: Switching on internal UTF-8 flaq on DBI result from database by liz
in thread Switching on internal UTF-8 flaq on DBI result from database by liz

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    choroba should make his presentation scaffolding public
    [Corion]: choroba: spod5 converts pod to S5 HTML, so it's also still basic. I find the lack of animations (in the sense of "highlight this", "highlight that" in code) somewhat tedious as I do it with rendered PNGs
    [Corion]: I haven't found a good way to include/use the source SVGs I use for creating the PNGs directly as animations
    [ambrus]: Presentations come in many different shapes, and so slides do as well.
    [Corion]: Doing that in Powerpoint or Ooxml would be nice(r) but I'm much quicker doing the outline of a presentation and the code as Pod
    [Corion]: Hurrr - on a machine that is behaving weirdly, I have two processes CROND running. I guess that is the source of unattended jobs sometimes not finding their files anymore...
    [ambrus]: Most of the time if I make slides, they're just a formatted document with a medium level of formality (between a well written article and an informal draft), with usually the page breaks chosen carefully and possibly some content repeated between pages.
    [Corion]: ambrus: My slides are mostly a list of things I want to talk about. But sometimes I want to point out interesting parts, or build up a larger image from small components. This is where animations/ highlights would come in well
    [choroba]: what I like about slides in HTML + CSS is I can use templates to produce them, which means all code in slides is tested, and I can version them in git
    [ambrus]: Btw, a request to everyone who organizes international conferences where presenters will show slides.

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