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How do I completely remove a key/value pair from my hash?

by vroom (His Eminence)
on Mar 02, 2000 at 23:33 UTC ( [id://4685]=perlquestion: print w/replies, xml ) Need Help??

vroom has asked for the wisdom of the Perl Monks concerning the following question: ⭐ (hashes)

How do I completely remove a key/value pair from my hash?

Originally posted as a Categorized Question.

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Re: How do I completely remove a key/value pair from a hash?⭐
by vroom (His Eminence) on Jan 21, 2000 at 01:38 UTC
    use delete 
    #Removes key and its associated value
delete $hash{key};

#gets rid of a slice of key/value pairs at once;
delete @hash {"first","second","third"};

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Re: How do I completely remove a key/value pair from my hash?⭐
by chromatic (Archbishop) on Mar 06, 2000 at 08:54 UTC
    Note that undef (Which many people try first) is the wrong answer. It only sets the value associated with a key to undef. That is usually not what you want: 
    my %hash = ('one' => 'two', 'two' => '2');
undef $hash{'one'};
print keys %hash;

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    This prints: twoone. Adding: print values %hash; prints: 2.
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