NSArray, NSMutableArray

+(id)arrayWithObjects:,...	create a new array with the list of passed objects. The list must end with ,nil.
-(int)count	returns count of objects in array
-(id)objectAtIndex:(int)	returns object at index (start counting at 0)
-(NSEnumerator*)objectEnumerator	return an enumerator (9.6) over all objects in array

NSMutableArray adds the following methods:

-(void)addObject:(id)obj	add the object to the end of the array
-(void)insertObject:(id)obj atIndex:(int)idx	insert new object before object with index idx
-(void)removeObject:(id)obj	remove all occurencies of object
-(void)removeAllObjects	remove all objects