This is probably a case of unnecessary optimization, but here are benchmark results for those interested:

             s/iter         join          dot interpolate1 interpolate
+2
join           2.22           --         -24%         -25%         -32
+%
dot            1.69          31%           --          -1%         -11
+%
interpolate1   1.67          33%           1%           --         -10
+%
interpolate2   1.50          48%          13%          12%           -
+-

[download]

And here's the code that generated this. I had to loop a bunch to get any kind of result. Not sure if this has any kind of effect on anything.

use strict;
use warnings;

use Benchmark qw/:all/;

my $string;

my ($var1, $var2, $var3) = ('asdf', 'zxcv', 'qwer');

cmpthese(4, {
    dot => sub {
        $string = $var1 . $var2 . $var3 for (0 .. 10000000);
    },  
    interpolate1 => sub {
        $string = "${var1}${var2}${var3}" for (0 .. 10000000);
    },  
    interpolate2 => sub {
        $string = "$var1$var2$var3" for (0 .. 10000000);
    },  
    join => sub {
        $string = join('', $var1, $var2, $var3) for (0 .. 10000000);
    },  
});

[download]

In reply to Re: String concatenation by Riales
in thread String concatenation by Anonymous Monk

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