(tye)Re: Hash Printing Question

${hash}{"key"} is the same as $hash{"key"} (for reasonably named variables) so I'd suggest you adopt the second style for most uses. But in a string expansion, ${var} is used like $var but (at least usually) stops interpretting at the closing } (this is all a bit imprecise in an attempt to be DWIMish) so you can write "Sold $n ${item}s" instead of "Sold $n $item"."s". So "${hash}{'key'}" is the same as $hash."{'key'}".

And $hash{"key"} is the same as $hash{key} if "key" is just letters, numbers, and underscores. So you can use any of these:

    print "name is $input_queue{name}\n";
    print "name is $input_queue{'name'}\n";
    print qq<name is $input_queue{"name"}\n>;
    print "name is ".$input_queue{"name"}."\n";
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to name just a few.

- tye (but my friends call me "Tye")

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(tye)Re2: Hash Printing Question by tye (Sage) on Dec 01, 2000 at 02:05 UTC
One minor correction: And `$hash{"key"}` is the same as `$hash{key}` if "key" is just letters, numbers, and underscores. I was worried that I didn't get that quite right and for good reason, too. `$hash{"012"}` is different than `$hash{012}` which is actually the same as `$hash{"10"}` since 012 (octal) == 10 (decimal). I worry there may be other special cases as well. Also, on slightly old versions of Perl, things like `$hash{time}` will get you a warning because, on even older versions of Perl, that meant `$hash{time()}` and we needed a transition period before it could unambiguously mean `$hash{"time"}` like it does now. - tye (but my friends call me "Tye")	[reply] [d/l] [select]

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(tye)Re2: Hash Printing Question
by tye (Sage) on Dec 01, 2000 at 02:05 UTC

One minor correction:

And $hash{"key"} is the same as $hash{key} if "key" is just letters, numbers, and underscores.

I was worried that I didn't get that quite right and for good reason, too. $hash{"012"} is different than $hash{012} which is actually the same as $hash{"10"} since 012 (octal) == 10 (decimal). I worry there may be other special cases as well.

Also, on slightly old versions of Perl, things like $hash{time} will get you a warning because, on even older versions of Perl, that meant $hash{time()} and we needed a transition period before it could unambiguously mean $hash{"time"} like it does now.

tye

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