SomeObject.h

//
//  SomeObject.h
//

#import <Cocoa/Cocoa.h>

@interface SomeObject : NSObject {
    NSMutableArray *things;
    NSMutableDictionary *someOtherThings;
}

@end

SomeObject.m

//
//  SomeObject.m
//

#import "SomeObject.h"

@implementation SomeObject

- (id)init {
	if (self=[super init]) {
		things=[[NSMutableArray arrayWithObjects:@"one",@"two",@"three",nil] retain];
		someOtherThings=[[NSDictionary alloc] init];
	}
	
	return self;
}

-(void)dealloc {
	[things release];
	[someOtherThings release];
	[super dealloc];
}

@end