A snippet with different usage examples in NodObjC. Not all of this works but the concepts are mainly correct

objc.js

var $ = require( 'NodObjC' );

// First you import the "Foundation" framework
$.import( 'Foundation' );
$.import( 'Cocoa' );

// Setup the recommended NSAutoreleasePool instance
var pool = $.NSAutoreleasePool( 'alloc' )( 'init' );

// NSStrings and JavaScript Strings are distinct objects, you must create an
// NSString from a JS String when an Objective-C class method requires one.

var s = 'dude';
var string = $.NSString( 'stringWithUTF8String', 'Hello Objective-C World!' );


$.NSLog( $(s) );
console.log( $(s) );
// Print out the contents (toString() ends up calling [string description])
console.log( string );


var frame = $.NSMakeRect( 0, 0, 200, 200 );

var win = $.NSWindow( 'alloc' )( 'initWithContentRect' , frame ,
 'styleMask' , $.NSBorderlessWindowMask ,
  'backing' , $.NSBackingStoreBuffered,
  'defer' , 'NO' );

win( 'setBackgroundColor', $.NSColor( 'blueColor' ) );

win( 'makeKeyAndOrderFront' , $.NSApp );

setTimeout((function() {

  /* drain the pool because we are done */
//	pool( 'drain' );
  
}), 5000);