Member Availability
| Has member? | Handler for missing member | |||
|---|---|---|---|---|
| Method | Field | Method | Field | |
| ABAP Objects | ||||
| C++ (STL) | ||||
| Objective-C (Cocoa) | forwardInvocation: | |||
| Smalltalk | x respondsTo: selector | doesNotUnderstand: | ||
| C# | (using reflection) | |||
| Java | ||||
| D | opDispatch | |||
| Eiffel | ||||
| Python | hasattr(x, "method") and callable(x.method) | hasattr(x, "field") | __getattr__ | |
| Visual Basic .NET | (using reflection) | |||
| Windows PowerShell | (using reflection) | |||
| F# | (using reflection) | |||
| Ruby | x.respond_to?(:method) | method_missing | ||
| PHP | method_exists(x, "method") | property_exists(x, "field") | __call | __get / __set |
| Perl | x->can("method") | exists x->{field} | AUTOLOAD | |
| Perl 6 | x.can("method") | x.field.defined | AUTOLOAD | |
| OCaml | ||||
| JavaScript | typeof x.method === "function" | field in x | ||
Read more about this topic: Comparison Of Programming Languages (object-oriented Programming)
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