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Undefined values: Difference between revisions
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Icon/Unicon don't really have a notion of an undefined variable. There is a [[Undefined_values/Check_if_a_variable_is_defined|null value/data type that can be tested]]. However, it is possible in Unicon to interrogate the environment and obtain the string names of variables in the current (or calling procedures).
==={{header|Icon}}===
==={{header|Unicon}}===
<lang Unicon>global G1
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