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

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Contributed by vroom on Mar 02, 2000 at 23:33 UTC
Q&A  > hashes


Answer: How do I completely remove a key/value pair from a hash?
contributed by vroom

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"};
Answer: How do I completely remove a key/value pair from my hash?
contributed by chromatic

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

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