Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?

Re: I just want to understand why ...

by Athanasius (Canon)
on Oct 08, 2012 at 08:18 UTC ( #997764=note: print w/ replies, xml ) Need Help??

in reply to Why does testing for the existence of hash keys create the keys ?

From exists:

Although the most deeply nested array or hash element will not spring into existence just because its existence was tested, any intervening ones will.

This is called autovivification. There is a good explanation of autovivification at

Hope that helps,

Athanasius <°(((><contra mundum

Comment on Re: I just want to understand why ...

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://997764]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others romping around the Monastery: (10)
As of 2015-10-13 08:58 GMT
Find Nodes?
    Voting Booth?

    Does Humor Belong in Programming?

    Results (297 votes), past polls