duck-typing {lambda.r} | R Documentation |
Duck typing is a way to emulate type checking by virtue of an object's characteristics as opposed to strong typing.
argument %isa% type argument %hasa% property argument %hasall% property
argument |
An object to inspect |
type |
A type name |
property |
A property of an object |
These operators provide a convenient method for testing for specific properties of an object.
%isa%
checks if an object is of the given type.
%hasa%
checks if an object has a given property. This can
be any named element of a list or data.frame.
Boolean value indicating whether the specific test is true or not.
Brian Lee Yung Rowe
5 %isa% numeric Point(r,theta, 'polar') %as% { o <- list(r=r,theta=theta) o@system <- 'polar' o } p <- Point(5, pi/2, 'polar') p