NSDictionary category that lets you retrieve a value from a dictionary of dictionaries in a single statement. I'm gonna feel really dumb if there was already a way to do this.

NSDictionary+Embedded.h

#import <Foundation/Foundation.h>


@interface NSDictionary (EmbeddedValue)

- (id)embeddedValueWithKeys:(NSArray *)keys;

@end

NSDictionary+Embedded.m

#import "NSDictionary+Embedded.h"


@implementation NSDictionary (EmbeddedValue)

- (id)embeddedValueWithKeys:(NSArray *)keys {
	id obj = self;
	for(id key in keys) {
		obj = [obj objectForKey:key];
		if(obj == nil)
			return nil;
	}
	return obj;
}

@end