array.m

#import <Foundation/Foundation.h>

int main() {
    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

    NSArray *keys = [NSArray arrayWithObjects:@"key1", @"key2", @"key3", nil];
    NSArray *objects = [NSArray arrayWithObjects:@"value1", @"value2", @"value3", nil];
    NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithObjects:objects forKeys:keys];
    for(id key in dictionary){
        NSLog(@"key: %@, value: %@", key, [dictionary objectForKey:key]);
    }
    id anObject = [[dictionary objectForKey:@"key2"] retain];
    [dictionary removeObjectForKey:@"key2"];
    NSLog(@"%@", dictionary);

    [pool release];
    return 0;
}