This is one idiom, 

%hash = (%hash, e => 'f', g => 'h', i => 'j');
%hash = (%otherhash, %hash);

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Order matters; the last instance of a key/value pair is the one that sticks to the key.

After Compline,
Zaxo

In reply to Re: Concerning hash operations (appending, concatenating) by Zaxo
in thread Concerning hash operations (appending, concatenating) by RazorbladeBidet

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