Re^3: Dereferencing a Hash of Arrays

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Re^4: Dereferencing a Hash of Arrays by toro (Beadle) on Jun 14, 2011 at 07:48 UTC
Thanks stefby, that works. But I don't understand why. Where does `$_` derive from in this case, and why do I need `""`?	[reply] [d/l] [select]
Re^5: Dereferencing a Hash of Arrays by stefbv (Priest) on Jun 14, 2011 at 08:21 UTC
From the perlvar man page: $_ is "The default iterator variable in a foreach loop if no other variable is supplied." Using double quotes is equivalent with a join operation that uses a space as EXPR. `join(' ', @$_)`	[reply] [d/l]
Re^6: Dereferencing a Hash of Arrays by jwkrahn (Abbot) on Jun 14, 2011 at 12:16 UTC
Using double quotes is equivalent with a join operation that uses a space as EXPR. Using double quotes is equivalent with a join operation that uses the variable $" as EXPR, where $" normally contains a single space character.	[reply]
Re^6: Dereferencing a Hash of Arrays by toro (Beadle) on Jun 14, 2011 at 20:19 UTC
Stefby, I am actually familiar with `$_` in general, but in this specific case I don't understand where its value comes from. I'm guessing it's because `$_` can handle lists and `say for` cannot? But, why? Here is my understanding of what's going on in your answer: `values %alphabet` spits out a list; `$_` iterates through that list (but why wasn't my original `say for` iterating through the list?) `@` dereferences the array (again, why didn't my original `@{...}` dereference it?) `" "` joins the output with `$"`. Would you mind correcting / clarifying the above? Thank you for your help so far.	[reply] [d/l] [select]
Re^7: Dereferencing a Hash of Arrays by Anonymous Monk on Jun 14, 2011 at 21:48 UTC
Re^5: Dereferencing a Hash of Arrays by Anonymous Monk on Jun 14, 2011 at 09:23 UTC
Most every perl comes with perldoc `$ perldoc -v $_ $ARG $_ The default input and pattern-searching space. The followi +ng ... ... ... ... ... ... ... (Mnemonic: underline is understood in certain operations.)` [download]	[reply] [d/l]