Latest benchmark: 

#!/usr/bin/env perl -slw

use strict;
use Benchmark qw[ cmpthese ];
use List::MoreUtils qw[ zip ];

sub zipA {
    my( $str1, $str2 ) = @_;
    $str1 =~ s/.\K/ substr $str2, 0, 1, ''/gesr;
}

sub zipB {
    no warnings qw/ uninitialized /;
    my( $a, $b ) = @_;
    my @a1 = split( '', $a );
    my @a2 = split( '', $b );
    return join'', zip @a1, @a2;
}

sub zipC($$){
   my( $n, $a, $b ) = ( 1, @_ );
   substr( $a, $n, 0, $_), $n += 2 for split '', $b;
   return $a;
};;

sub zipD {
    my ($str1, $str2) = @_;
    for (0 .. length $str2) {
        substr $str1, $_ * 2 + 1, 0, substr $str2, $_, 1;
    }
    return $str1;
}

our $A = 'ABCDEFGHIJ';
our $B = 'abcde';

cmpthese -1, {
    A => q[ my $zipped = zipA( $A, $B ); ],
    B => q[ my $zipped = zipB( $A, $B ); ],
    C => q[ my $zipped = zipC( $A, $B ); ],
    D => q[ my $zipped = zipD( $A, $B ); ],
};

[download]

I ran it five times. This seems to be the most representative: 

      Rate    B    A    C    D
B  91995/s   -- -39% -66% -72%
A 151837/s  65%   -- -45% -54%
C 274373/s 198%  81%   -- -17%
D 330831/s 260% 118%  21%   --

[download]

-- Ken

In reply to Re: Merge 2 strings like a zip [benchmark] by kcott
in thread Merge 2 strings like a zip by tel2

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.