in reply to Hash of hashes problem

The syntax you are looking for is keys %{$people{$key}}

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Re^2: Hash of hashes problem
by lsteele (Initiate) on Oct 11, 2007 at 13:50 UTC
    Thank you!! Without wishing to seem lazy, do you know where this is explained in the perl documentation? (I have looked.)
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        Dereferencing a hash? I don't see it in perlref, but it is in perlreftut.
        If you're talking about examples of dereferencing hash references, perlref does show a lot of them. To name a few (comments are mine)...,
        ....you can replace the identifier with a simple scalar variable.... 
        ...
$$arrayref[0] = "January";
$$hashref{"KEY"} = "VALUE"; # deref the hash, assign a key
&$coderef(1,2,3);
...

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        ....you can replace the identifier with a BLOCK returning a reference.... 
        ...
${$arrayref}[0] = "January";
${$hashref}{"KEY"} = "VALUE"; # same as above, differet syntax
&{$coderef}(1,2,3);
...

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        .... As a form of syntactic sugar.... 
        $arrayref->[0] = "January";
$hashref->{"KEY"} = "VALUE"; # still the same, witha arrow operator
$coderef->(1,2,3);

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        So does perlreftut, I suppose. Talking about words, that doc doesn't even have a single word of "dereference" or "dereferencing", though it doesn't matter to me. But I didn't know if perlreftut talked about dereferencing a hash, or any other docs. :-)

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