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Re: Answer: How do I empty out a hash?

by NetWallah (Canon)
on Aug 16, 2003 at 04:52 UTC ( [id://284312]=note: print w/replies, xml ) Need Help??


in reply to Re: How do I empty out a hash?
in thread How do I empty out a hash?

If you really wanted to iterate over the hash, using katie's method, there is no point in fetching the VALUE, only to throw it away. Hence, I'd code it thus: 
#!/usr/bin/perl -w
use strict;

my %hash = ( Carol => 22, Mary => 21, Chris => 30 );

for (keys %hash){
   delete $hash{$_};
};

[download]
which is a little easier on the eye ...

Replies are listed 'Best First'.
Re^2: Answer: How do I empty out a hash?
by Aristotle (Chancellor) on Aug 16, 2003 at 18:07 UTC
    That builds a list of keys up front - may or may not be a bad idea. If it is, I use each in scalar context to get something similar looking: 
    my $k;
delete $hash{$k} while $k = each %hash;

    [download]
    (Incidentally, I'd write your version like so:) 
    delete $hash{$_} for keys %hash;

    [download]

    Makeshifts last the longest.

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