Objective C implementation of merge assignment

merge.m

// ~ 27 loc

#import <Foundation/Foundation.h>

@interface Main : NSObject
{
    NSMutableArray *a1, *a2, *merged;
}

@property(nonatomic, assign) NSMutableArray *a1, *a2, *merged;

- (NSMutableArray *)merge;

@end

@implementation Main

@synthesize a1, a2, merged;

-(NSMutableArray*)merge {
    merged = [NSMutableArray arrayWithCapacity:a1.count+a2.count];
    while (a1.count != 0 && a2.count != 0) {
        if ([[a1 objectAtIndex:0] intValue] < [[a2 objectAtIndex:0] intValue]) {
            [merged addObject:[a1 objectAtIndex:0]];
            [a1 removeObjectAtIndex:0];
        } else {
            [merged addObject:[a2 objectAtIndex:0]];
            [a2 removeObjectAtIndex:0];
        }
    }
    [merged addObjectsFromArray:(a1.count == 0 ? a2 : a1)];
    return merged;
}

@end

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    Main* m = [[Main alloc] init];
    m.a1 = [NSMutableArray arrayWithObjects: 
                          [NSNumber numberWithInt:1],
                          [NSNumber numberWithInt:3],
                          [NSNumber numberWithInt:5],
                          [NSNumber numberWithInt:7],
                          [NSNumber numberWithInt:9],
                          [NSNumber numberWithInt:11],nil];
    
    m.a2 = [NSMutableArray arrayWithObjects: 
                          [NSNumber numberWithInt:2],
                          [NSNumber numberWithInt:4],
                          [NSNumber numberWithInt:6],
                          [NSNumber numberWithInt:8],
                          [NSNumber numberWithInt:10],
                          [NSNumber numberWithInt:12],nil];
    
    [m merge];
    
    for(NSNumber* n in m.merged) {
        NSLog(@"%d",[n intValue]);
    }    
    
    [m release];
    [pool drain];
    return 0;
}