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add link to Delphi for pascal
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GP does not have good facilities for this, but this test suffices for most purposes:
<lang parigp>foo!='foo</lang>
=={{header|Pascal}}==
See [[Undefined_values/Check_if_a_variable_is_defined#Delphi | Delphi]]
=={{header|Perl}}==
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<lang perl>say $number // "unknown";</lang>
prints $number if it is defined (even if it is false) or the string "unknown" otherwise.
=={{header|Perl 6}}==
{{trans|Haskell}} (as it were...)
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