Re^2: comparing two array

by Crian (Curate)

on Jun 17, 2009 at 12:37 UTC ( [id://772373]=note: print w/replies, xml )

Need Help??

Shouldn't it be

print exists $h{$elem} ? "Yes" : "No";
[download]

the second example?

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Re^3: comparing two array by JavaFan (Canon) on Jun 17, 2009 at 12:42 UTC
Considering all the values in `%h` are `1`, it doesn't make any difference whether you use `exists $h{$elem}`, `defined $h{$elem}` or `$h{$elem}`.	[reply] [d/l] [select]
Re^3: comparing two array by citromatik (Curate) on Jun 17, 2009 at 12:54 UTC
In this case... `print defined $h{$elem} ? "Yes" : "No"; print exists $h{$elem} ? "Yes" : "No"; print $h{$elem} ? "Yes" : "No";` [download] Are all equivalent (give the same result). `exists` returns true if the specified element in the hash has ever been initialized, even if its current value is `undefined`. In this case, all elements has been initialized to `1`. If you `undef`ine one element of the hash, for example `undef $h{$elem}`, then `$h{$elem}` still exists, but its value is `undef` citromatik	[reply] [d/l] [select]

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