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Freeing up memory by undefining perl variables

What is the difference between undef($variable_name) and
$vaiable_name = undef;? And is there any function in perl which dynamically deallocates the allocated memory for scalars? same question for lists and hashes.

Thanks & Regards,
Pavan Kumar
Sep 23 '08 #1
1 4920
4,059 Expert 2GB
undef(variable) completely deletes the variable

variable = undef assigns the undef value to a variable

As far as I know if you do something like this:

$foo = 'some value';
$foo = ''; <-- frees up memory

@foo = (1..1000000);
@foo = (); <-- frees up the memory

I am not sure if you undef(variable) it will free up the memory. I don't know if there is a module that frees up memory.
Sep 23 '08 #2

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