Re: Returning the first key in a hash...

[Sudarshan Raghavan]

Hamish Whittal wrote:

Ok, thanks Sudarshan, but why did this not work?

pop ( keys (%hash) );

perldoc -f pop
pop works on arrays, keys returns a list (perldoc -f keys)
perldoc -q 'What is the difference between a list and an array?'
Anyways, pop returns the last element of the array not the first. shift 
will return the first element of the array (perldoc -f shift)
But, shift will work on arrays only not lists.

Thanks. 
H
On Thu, 2003-06-12 at 14:39, Sudarshan Raghavan wrote:
 

Hamish Whittal wrote:

   

Hi all,

I have a hash and want to return the first key in the hash. How can I do
this?
     

The answer is (keys (%your_hash))[0]. This will return the first element 
in the list of hash keys returned by keys. But, you can never be sure of 
the order in which the keys will be retrieved. If you are worried about 
the order, take a look at the Tie::IxHash module.

   

Thanks in advance,

Hamish



     



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