gistfile1.txt

Objective-J / Objective-C differences:

1. No @interfaces, just combine the @interface with @implementation:

@implementation MyGreatClass : CPObject
{
    CPString myString;
}

- (id)init
{
   self = [super init];

   if (self)
   {
      myString = @"hello";
   }

   return self;
}

@end

2. No pointers (everything is a reference), and no more type declarations:

Instead of:

NSArray * x = [NSArray array];

Do:

var x = [CPArray array];

3. Instead of #import, use @import:

@import <Foundation/Foundation.j>

4. Instead of NS, use CP, only use CGRect (like iPhone)

myView = [[CPView alloc] initWithFrame:CGRectMake(0.0, 0.0, 100.0, 200.0)];

And that's it (aside from being able to use all the features of JavaScript if you choose to do so as well of course).