in reply to Pushing a delimiter into an array?

You could also use perl's $LIST_SEPARATOR $" (see perldoc perlvar). 
perl -E 'my @x=0..5; local $"=qq|\t|; say "@x"'
0    1    2    3    4    5

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Slightly more dramatic: 
perl -E 'my @x=0..5; local $"=qq|= \t =|; say "=@x="'
=0=      =1=      =2=      =3=      =4=      =5=

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        What is the sound of Perl? Is it not the sound of a wall that people have stopped banging their heads against?
              -Larry Wall, 1992

In Section Seekers of Perl Wisdom