Hi,

Thanks - I was actually doing some benchmarks after I wrote this :) Here are the results: 

    C:\Users\Andy\Documents>perl test.pl
    Length of string: 101000000
    Time taken was  0 wallclock secs ( 0.17 usr  0.03 sys +  0.00 cusr
+  0.00 csys =
     0.20 CPU) seconds

    Time taken was  1 wallclock secs ( 1.13 usr  0.03 sys +  0.00 cusr
+  0.00 csys =
     1.16 CPU) seconds
    C:\Users\Andy\Documents>

[download]
The 1st one uses: 
    my $new_string = testing_string($string);

    sub testing_string {
        my $content = $_[0];
        # do some stuff
        $content =~ s/a/b/sg;
        return $content;
    }

[download]
..where as the "slower" one, does: 
    # do stuff here
    my %test_var;
    $test_var{$string} = $string;
    testing_string();
    $string = $test_var{$string};

    sub testing_string_2 {
        # do some stuff here
        $test_var{$string} =~ s/a/b/sg;  
    }

[download]
>> Then you should avoid making copies. Note that passing strings to functions does not make a copy (@_ aliases), but my $long_content = $_[0]; does.

Not sure what you mean?

TIA

Andy

In reply to Re^2: Whats quicker - passing along as variable to sub, or global var? by ultranerds
in thread Whats quicker - passing along as variable to sub, or global var? by ultranerds

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