Think of it this way, delete needs to pieces of information: the hash you delete from, and the key. $href1 is a reference to the *value* belonging to $HoH{flintstones}, while $href2 is the value itself.

Given the reference, there's no way to find which key it belongs to. In fact, the value could appear several times in the hash, or even in different hashes.

In reply to Re: Deleting from Hash-of-Hash using references by JavaFan
in thread Deleting from Hash-of-Hash using references by dol

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