> Hi, > > Richard Heintze wrote: > > >I have an array of hashes. What function should I be > >using to interrogate each array cell when I want to > >know if it is occupied? > > > > "exists" seemed to do the job nicely. What about > >"defined"? > > > exists only works with hashes. Please check the recent conversation about "Array containment", where Rob Dixon advised me to turn my array into a hash to use the exists function. >
Caveat version... depends on the version of Perl. Newer 'exists' can check arrays... from perldoc -f exists: "Given an expression that specifies a hash element or array element, returns true if the specified element in the hash or array has ever been initialized...." Works at least as of 5.6.1. As to your other question, check out: perldoc -f ref You may also find, perldoc UNIVERSAL particularly 'isa' helpful... http://danconia.org -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] <http://learn.perl.org/> <http://learn.perl.org/first-response>
