Re^5: Generating an array of n identical elements

my @new = map { transform $_ } @old; is faster than

my @new;
push @new, transform $_ for @old;
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I'm wary of your results though. My gut feeling is that something is getting optimized away at compile time, but I can't seem to get it deparsed like that. Maybe x is really 168x faster than map in this case (and in your perl build and on your machine)..

Makeshifts last the longest.

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Re: Re^5: Generating an array of n identical elements by bronto (Priest) on Sep 16, 2002 at 14:26 UTC
something is getting optimized away at compile time Maybe it is due to the fact that Blake's was a real subroutine with parameters and mine is more like a <code>constant<code>... I expected a wider difference in my test case. Of course, Blake's is far more general than mine and it's results are much more reliable. Ciao! `--bronto` # Another Perl edition of a song: # The End, by The Beatles END { $you->take($love) eq $you->made($love) ; }	[reply]

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Re: Re^5: Generating an array of n identical elements
by bronto (Priest) on Sep 16, 2002 at 14:26 UTC

something is getting optimized away at compile time

Maybe it is due to the fact that Blake's was a real subroutine with parameters and mine is more like a <code>constant<code>...

I expected a wider difference in my test case. Of course, Blake's is far more general than mine and it's results are much more reliable.

Ciao!
--bronto

# Another Perl edition of a song:
# The End, by The Beatles
END {
  $you->take($love) eq $you->made($love) ;
}

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