Try this:

sub zipD($$) {
    my( $a, $b ) =  (my $o = length( $_[0] ) >= length( $_[1] ) ) ? @_
+[ 0, 1 ] : @_[ 1, 0 ];
    substr( $a, $_*2+$o, 0, substr( $b, $_, 1 ) ) for 0 .. length( $b 
+) -1;
    return $a;
}

[download]

Output:

C:\test>1133857.pl
AaBbCcDdEeFGHIJaAbBcCdDeEFGHIJ
AaBbCcDdEeFGHIJaAbBcCdDeEFGHIJ
       Rate   Rr   rR   Dd   dD
Rr  85339/s   --  -1% -40% -41%
rR  86543/s   1%   -- -39% -40%
Dd 142186/s  67%  64%   --  -2%
dD 145076/s  70%  68%   2%   --

[download]
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
I'm with torvalds on this Agile (and TDD) debunked I told'em LLVM was the way to go. But did they listen!

In reply to Re^5: Merge 2 strings like a zip [benchmark] by BrowserUk
in thread Merge 2 strings like a zip by tel2

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