I am trying to populate a hash with key/value pairs, basically the file name and its
dates. I am extracting part of the file name to use as the key. Some of the keys will
be the same. I want to put a new value in only if its newer than the value currently
stored.
My problem is, how do I know there is a value based on the key? If there is already
one there, the comparison is easy, but what do I get as the value if the key/value has
not been used? Is there a way to know if the value has not been assigned?
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