Objective-J/Class
Objective-J has two types of objects:
- Native JavaScript objects and Objective-J objects.
- Native JS objects are exactly what they sound like, the objects native to JavaScript.
- Objective-J objects are a special type of native object added by Objective-J.
These new objects are based on classes and classical inheritance, like C++ or Java, instead of the prototypal model.
Classes
[edit | edit source]Creating a class in Objective-J is simple. Here’s an example of a Person class that contains one member variable, name:
@implementation Person : CPObject
{
CPString name;
}
@end
The beginning of a class is always the keyword @implementation
, followed by the class name. The third term, after the colon, is the class you want to subclass. In this case, we’re subclassing CPObject
, which is the root class for most classes. You don’t need a superclass, but nearly all the time you will want one.
After the declaration, a block enclosed with brackets is used to define all your member variables. Each variable is declared on its own line with a type and variable name, and a semicolon. Technically the type is optional, but its highly recommended. Declaring your member variables is important, because any variable used elsewhere in your class that isn’t declared will automatically become a global variable.
To end a class declaration, add the keyword @end
.