Or just use the existing functionality provided by Data::Dumper:
use Data::Dumper;
$Data::Dumper::Indent = 0;
my @arr = qw(book dog cat);
print Dumper(\@arr);
If you want to do your way, then fix those ' and ":
my @arr = qw(book dog cat);
print "[" . join(',', @arr) . "];\n";
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