No
you're making it too complicated! :-)
The first problem is initializing the string with that quote.
That causes the next, of concat in a loop, leaving crud at the end of the string.
The dominoes continue to fall as ya chop chop chop away the first two mistakes.
Finally, having to add a quote to the end of a sting is a bad sign that something went wrong earlier, which is now being hacked into compliance.
Also you should know that printing from inside subs is a bad habit, but don't ask me how I know. It just quickly leads to layers of confusion. May I suggest:
say run();
sub run
{
my @arr = (12341,1245125,1525125,125125125);
my $str = join '', '"', (join ' || ', map {"job==$_"} @arr), '"';
return $str
}
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