The simplest approach is: $_ = join ',' => @$_ for @array; Or, written less idiomatically:

for my $e (@array) {
  $e = join ",", @$e;
}
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Jeff[japhy]Pinyan: Perl, regex, and perl hacker, who'd like a job (NYC-area)
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;