R: Functions for duck typing
duck-typing | R Documentation |
Functions for duck typing
Description
Duck typing is a way to emulate type checking by virtue of an
object's characteristics as opposed to strong typing.
Usage
argument %isa% type
argument %hasa% property
argument %hasall% property
Arguments
argument |
An object to inspect
|
type |
A type name
|
property |
A property of an object
|
Details
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.
Value
Boolean value indicating whether the specific test is true or not.
Author(s)
Brian Lee Yung Rowe
See Also
%as%
Examples
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
Results
|