in reply to Re: Unique value count in hash not working properlyin thread Unique value count in hash not working properly
Autovivification, a hashref springs into existence under key fa , bar key is assigned the value 1
Autovivification, you use it as a reference to a hash, , it becomes a reference to a hash
Autovivification, you use it as a reference to an array, it becomes a reference to an array
Initialization, you declare $foo and assign a reference, you can use it as a reference, but it doesn't become a reference, because it already is a reference
Error, can only autovivify if undef, Not an ARRAY reference
Error, can only autovivify once, Not a HASH reference
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