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Perl in a Nutshell, 2nd Edition
book

Perl in a Nutshell, 2nd Edition

by Nathan Patwardhan, Ellen Siever, Stephen Spainhour
June 2002
Beginner content levelBeginner
759 pages
80h 42m
English
O'Reilly Media, Inc.
Content preview from Perl in a Nutshell, 2nd Edition

Name

keys

Synopsis

keys %hash
                  

Returns a list consisting of all the keys of the named hash. The keys are returned in an apparently random order, but it is the same order that either the values or each function produces (assuming that the hash has not been modified between calls).

In scalar context, keys returns the number of elements of the hash (and resets the each iterator).

keys can be used as an lvalue to increase the number of hash buckets allocated for the hash:

keys %hash = 200;
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Publisher Resources

ISBN: 0596002416Errata Page