Null object: Difference between revisions

Content added Content deleted
m (add link to Delphi for pascal)
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=={{header|Python}}==
<lang python>x = Nonetry:
if x is None: x
except NameError:
print "x is Noneundefined"
else:
print "x is not Nonedefined"</lang>
</prelang>▼
Output:<pre>
x is None
▲</pre>
 
=={{header|R}}==
Retrieved from "https://rosettacode.org/wiki/Null_object"