Thanks for reply. i did some benchmarking and found that map is slower than foreach.
Also I was under impression that map is actually faster than foreach, but my result is different ! 
#!/opt/gsperl-5.8.6_1/bin/perl


use strict;
use Benchmark;
my ($start,$end,$diff);

my @data = (1..20000000);

# start timer
$start = new Benchmark;
my %dataseen;

my @arr;

foreach my $x (@data) {
    push @arr, ($x+2);
}
# end timer
$end = new Benchmark;

# calculate difference
my $diff = timediff($end, $start);
# report
print "Time taken by foreach loop was ", timestr($diff, 'all'), " seco
+nds\n";


my $start1 = new Benchmark;
my @arr1;
@arr1 = map { push @arr1, ($_+ 2) } @data;

# end timer
my $end1 = new Benchmark;

# calculate difference
my $diff1 = timediff($end1, $start1);

# report
print "Time taken by map block was ", timestr($diff1, 'all'), " second
+s\n";

[download]
and output of code :
Time taken by foreach loop was 9 wallclock secs ( 8.22 usr 0.32 sys + 0.00 cusr 0.00 csys = 8.54 CPU) seconds
Time taken by map block was 15 wallclock secs (14.88 usr 0.72 sys + 0.00 cusr 0.00 csys = 15.60 CPU) seconds

In reply to Re^2: Map Vs Foreach by perlCrazy
in thread Map Vs Foreach by perlCrazy

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.