Re^2: counting elements using a hash

next unless $number; #skip undef's

What happens if the extracted $number string is '0'? Will zeros be counted?

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Re^3: counting elements using a hash by Marshall (Canon) on Sep 23, 2012 at 12:28 UTC
That is a good point. These zero's or undef's are problematic. The problem statement had 1..100 so this zero didn't enter into the situation. In this case, $number==0 should be skipped (same as undef). So what about $number >100? Well, the OP should should show some revised code and we will iterate again to get it fine tuned. A major point was that Perl will create a new key (auto-vivify) when needed - there is no need to test whether or not the key exists. Second point was a numeric instead of alpha sort.	[reply]

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Re^3: counting elements using a hash
by Marshall (Canon) on Sep 23, 2012 at 12:28 UTC

The problem statement had 1..100 so this zero didn't enter into the situation. In this case, $number==0 should be skipped (same as undef). So what about $number >100? Well, the OP should should show some revised code and we will iterate again to get it fine tuned. A major point was that Perl will create a new key (auto-vivify) when needed - there is no need to test whether or not the key exists. Second point was a numeric instead of alpha sort.

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