To defend his technique I slightly modified his benchmarking script: 
#!/usr/bin/perl
use strict;
use warnings;
use Benchmark qw( cmpthese );

my $count = shift || 100000;
my @test_array = (0 .. 99);

sub map_bench 
{
    my $result = join(', ', map { '?' } @test_array);
}

sub x_bench 
{
    my $result = '?, ' x @test_array;
}

cmpthese($count, {
    map => \&map_bench, 
    x   => \&x_bench, 
});

__END__

Benchmark: timing 100000 iterations of map, x...
       map: 28 wallclock secs (27.94 usr +  0.00 sys = 27.94 CPU) @ 35
+78.97/s (n=100000)
         x:  1 wallclock secs ( 0.77 usr +  0.00 sys =  0.77 CPU) @ 12
+9533.68/s (n=100000)
        Rate   map     x
map   3579/s    --  -97%
x   129534/s 3519%    --

[download]
Update: Unfortunately I forgot about the first reason of using join - getting rid of the last comma. Perhaps it should be 
my $result = ('?, ' x $#test_array) . '?'

[download]
It's not as elegant as it was. But still simpler than 
my $result = join(', ', map { '?' } @test_array);

[download]

In reply to Re: Re: Fast Building of SQL Statements by zby
in thread Fast Building of SQL Statements by hardburn

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