If you're ok with undef instead of the empty string for missing elements, you could use Algorithm::Loops's MapCharU. 

use Algorithm::Loops qw( MapCharU );

my $bar = [ MapCharU { [ @_ ] } @$foo ];

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The block could be changed to convert undefined values into empty strings, but it wouldn't be able to distinguish between undefined values in $foo and missing elements in $foo.

In reply to Re: rearranging an array of arrays by ikegami
in thread rearranging an array of arrays by punkish

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