modifying the key of hash of arrays

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

hi, i have a hash of arrays where i want to change the name of the key. How would I access the key and then change its name. i am trying

 $b="blah";  
      $hasharr{$rephead}=$b;
      #but i think i am accessing the array rather than the key.
[download]

thanks.

Comment on modifying the key of hash of arrays Download Code

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Re: modifying the key of hash of arrays by davido (Cardinal) on Oct 16, 2003 at 07:56 UTC
Keys themselves are immutable. However, you can assign the value held in a hash element to a new key and delete the old one. "I am trying: `$b="blah"; $hasharr{$rephead}=$b; #but i think i am accessing the array rather than the key.` [download] Yes, you are writing "blah" into the value of the hash key/value pair, overwriting the anonymous array you had stored there. Here is what you need to do: `$hasharr{$newkey} = $hasharr{$rephead}; delete $hasharr{$rephead};` [download] Dave "If I had my life to do over again, I'd be a plumber." -- Albert Einstein	[reply] [d/l] [select]
Re: Re: modifying the key of hash of arrays by hardburn (Abbot) on Oct 16, 2003 at 13:41 UTC
delete returns the value of the key it deleted, so you actually only need: `$hasharr{$newkey} = delete $hasharr{$rephead};` [download] ---- I wanted to explore how Perl's closures can be manipulated, and ended up creating an object system by accident. -- Schemer `:(){ :\|:&};:` Note: All code is untested, unless otherwise stated	[reply] [d/l] [select]