print out keys of hash with carriage returns

bengmau has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: print out keys of hash with carriage returns by sth (Priest) on Nov 03, 2004 at 18:46 UTC
print RPTOUT join( "\n", keys %tapeid)	[reply]
Re^2: print out keys of hash with carriage returns by bengmau (Beadle) on Nov 03, 2004 at 18:52 UTC
that's it.. the light bulb has turned back on	[reply]
Re: print out keys of hash with carriage returns by Zaxo (Archbishop) on Nov 03, 2004 at 18:50 UTC
One way is to set the output ~~record~~ field seperator, `{ local $, = "\n"; print RPTOUT keys(%tapeid), "\n"; }` [download] You could instead call `join "\n", . . .` on the keys. Update: sth++, corrected. After Compline, Zaxo	[reply] [d/l]
Re^2: print out keys of hash with carriage returns by sth (Priest) on Nov 03, 2004 at 19:44 UTC
...one minor correction, $, is output field serperator, $\ is output record serpperator.	[reply]
Re: print out keys of hash with carriage returns by pg (Canon) on Nov 03, 2004 at 18:50 UTC
Or `print FILE "$_\n" for (keys %hash);` [download]	[reply] [d/l]
Re: print out keys of hash with carriage returns by fletcher_the_dog (Friar) on Nov 03, 2004 at 19:19 UTC
Another variation `map{print RPTOUT "$_\n"} keys %tapeid;` [download]	[reply] [d/l]
Re^2: print out keys of hash with carriage returns by revdiablo (Prior) on Nov 03, 2004 at 22:50 UTC
That is indeed another way to do the same thing, but many argue against using map in void context. In older versions of perl, it was inefficient, because it would build a list of return values. In newer versions of perl, it's just bad style.	[reply]
Re: print out keys of hash with carriage returns by superfrink (Curate) on Nov 03, 2004 at 19:39 UTC
I always do this when I just want to see what's in a hash: `use Data::Dumper; print Dumper(\%hash); print Dumper($hashref);` [download] Don't forget the backslash so that a reference gets passed to the function.	[reply] [d/l]


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