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). |
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). |
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==={{header|Icon}}=== |
==={{header|Icon}}=== |
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The functions localnames, paramnames, staticnames, and globalnames don't exist in Icon. |
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==={{header|Unicon}}=== |
==={{header|Unicon}}=== |
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<lang Unicon>global G1 |
<lang Unicon>global G1 |
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