Re: why such an error?

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Re^2: why such an error? by lightoverhead (Pilgrim) on Sep 25, 2008 at 20:30 UTC
Thank you for your answer. Other than using the magic "++". Could we have another method to define the `$dup{$row[3]}`? Thanks.	[reply] [d/l]
Re^3: why such an error? by GrandFather (Saint) on Sep 25, 2008 at 23:24 UTC
There are a number of ways you could do it: `$dup{$row[3]} = $dup{$row[3]} + 1; # Has trouble with undef $dup{$row[3]} += 1; ++$dup{$row[3]}; $dup{$row[3]}++;` [download] += and ++ are magical to the extent that they can update an undef value without complaint. That is often very useful, especially where a hash or array element is autovivified. For example, if you are using a hash to count the number of occurrences of words in a string you could: `++$wordCount{$_} for split ' ', $string;` [download] which generates an entry in %wordHash for each word and increments the count - very clear and concise. Perl reduces RSI - it saves typing	[reply] [d/l] [select]
Re^3: why such an error? by rovf (Priest) on Sep 26, 2008 at 08:59 UTC
You seem to have an inclination for dyadic plus ;-) `$dup{$row[3]} = ($dup{$row[3]}\|\|0) + 1;` [download] -- Ronald Fischer <ynnor@mm.st>	[reply] [d/l]