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:
“If you attack the establishment long enough and hard enough, they will make you a member of it.”
—Art Buchwald (b. 1925)
“Since ... six weeks ago, there has been no day in which I have not had letters and visits on the subject of my nomination for the Presidency.... I say very little. I have in no instance encouraged any one to work to that end.... I have said the whole talk about me is on the score of availability. Let availability do the work then.”
—Rutherford Birchard Hayes (18221893)