PERL Beginners - Hash of Lists

Author

Hash of Lists

Andrew Black

2005-06-06, 8:55 am

I am trying to set up a Hash of Lists and am following the example
http://www.perl.com/doc/manual/html...HASHES_OF_LISTS

Specifically
# append new members to an existing family
push @{ $HoL{"flintstones"} }, "wilma", "betty";

I don't understand why the construct @{ xxxxx } is written that way.
Can someone explain what it is trying to do and why it is written that way.

Andrew

Wijaya Edward

2005-06-06, 8:55 am

> Specifically
> # append new members to an existing family
> push @{ $HoL{"flintstones"} }, "wilma", "betty";
>
> I don't understand why the construct @{ xxxxx } is written that way.

Step by step, what it does is:
1. Dereference the List in the Hash with key "flinstones" ---> @{$array_ref} is dereferncing an array $array_ref
2. Thus you have an array of that hash (i.e. flinstones as key).
3. Finally you push "wilma" and "betty" into that array

Hope it's clear.

---
Regards,
Edward WIJAYA
SINGAPORE

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