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Re^4: Counting the number of items returned by split without using a named array

by Anonymous Monk
on May 03, 2006 at 15:02 UTC ( #547169=note: print w/replies, xml ) Need Help??


in reply to Re^3: Counting the number of items returned by split without using a named array
in thread Counting the number of items returned by split without using a named array

As you wish (or not):
$ cat foo.pl ; echo "--------";echo; ./foo.pl #!/usr/bin/perl ################## use Benchmark qw(:all) ; sub test1(){ $entries = @{[ split ]}; } sub test2(){ $entries = () = /\S+/g; } $_="This is an example string with several words bla bla bla\n"; $count=1E+7; timethis ($count, "test1()"); print "------------\n"; timethis ($count, "test2()"); -------- timethis 10000000: 13 wallclock secs (12.37 usr + 0.01 sys = 12.38 CP +U) @ 807754.44/s (n=10000000) ------------ timethis 10000000: 7 wallclock secs ( 6.66 usr + 0.00 sys = 6.66 CP +U) @ 1501501.50/s (n=10000000)
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Re^5: Counting the number of items returned by split without using a named array
by blazar (Canon) on May 04, 2006 at 10:49 UTC

    Adding use warnings; results in

    Use of uninitialized value in split at foo.pl line 9.

    Hmmm... adding (-l and) print $entries to both subs results in:

    Use of uninitialized value in split at foo.pl line 9. 0 Use of uninitialized value in pattern match (m//) at foo.pl line 14. 0

    Now,

    #!/usr/bin/perl use strict; use warnings; use Benchmark qw(:all :hireswallclock); my $str="This is an example string with several words bla bla bla"; sub test1 () { local $_=$str; my $entries = @{[ split ]}; } sub test2 () { local $_=$str; my $entries = () = /\S+/g; } cmpthese -10, { deref => \&test1, goatse => \&test2, }; __END__

    results in

    Rate goatse deref goatse 16325/s -- -42% deref 28017/s 72% --

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