Null object: Difference between revisions
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=={{header| |
=={{header|langur}}== |
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Null can be compared for directly, using equality operators, or can be checked with the isNull() function. Database operators (ending with ? mark) propagate null. A null in an expression test is a non-truthy result. |
Null can be compared for directly, using equality operators, or can be checked with the isNull() function. Database operators (ending with ? mark) propagate null. A null in an expression test is a non-truthy result. |
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<lang |
<lang langur>var (.x, .y) = (true, null) |
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writeln .x == null |
writeln .x == null |
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