No need to nest loops. The condition you mentioned can be checked without iterating through each entire hash. You still have to iterate through the array, though. 
for (@$pages) {
  $_->{flag} = 1 if $_->{url} eq "/html/about.html";
}

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If you want to get really fancy, it can be a one liner, but I think that using logical connectives (and/or) for flow control hurts readability, especially in a complex statement with modifiers. 
$_->{url} eq "/html/about.html" and $_->{flag} = 1 for @$pages;

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blokhead

In reply to Re: Clean way of adding values to complex data structure by blokhead
in thread Clean way of adding values to complex data structure by Rodster001

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