Re: How do I empty out a hash?

by arno (Scribe)

on Oct 04, 2003 at 12:39 UTC ( [id://296498]=note: print w/replies, xml )

Need Help??

Hi,

To delete a key, you don't need to know her value.
Here's my code :

my %hash = ( Carol => 22, Mary => 21, Chris => 30 );
map { delete $hash{$_} } keys %hash;
[download]

Update: Of course this makes use of map in void context. Yick. And a couple other suggestions came in by way of followup:

Arnaud

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Re: Answer: How do I empty out a hash? by Aristotle (Chancellor) on Oct 04, 2003 at 16:10 UTC
Easier yet. `delete @hash{(keys %hash)};` [download] Update: this is, of course, only useful when you want to use delete the keys from one hash in another one, as in `delete @foo{(keys %bar)};` [download] Otherwise, only the below solution makes any sense. Makeshifts last the longest.	[reply] [d/l] [select]
Re: Re: Answer: How do I empty out a hash? by Anonymous Monk on Oct 04, 2003 at 16:23 UTC
Even more easier! `%hash = ();` [download] And twice more quicker also.	[reply] [d/l]

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