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)
Famous quotes containing the words member and/or availability:
“While waiting to get married, several forms of employment were acceptable. Teaching kindergarten was for those girls who stayed in school four years. The rest were secretaries, typists, file clerks, or receptionists in insurance firms or banks, preferably those owned or run by the family, but respectable enough if the boss was an upstanding Christian member of the community.”
—Barbara Howar (b. 1934)
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—Rutherford Birchard Hayes (1822–1893)