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jnjosh/NSDictionary+Subtraction.h

Created February 1, 2012 01:45
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A painfully simple and probably incomplete NSDictionary Subtraction method
Raw
NSDictionary+Subtraction.h
@interface NSDictionary (Subtraction)
- (NSDictionary *)subtractDictionary:(NSDictionary *)dictionary;
@end
Raw
NSDictionary+Subtraction.m
@implementation NSDictionary (Subtraction)
- (NSDictionary *)subtractDictionary:(NSDictionary *)dictionary {
NSMutableDictionary *differenceDictionary = [NSMutableDictionary dictionary];
[self enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
if (! [dictionary objectForKey:key]) [differenceDictionary setObject:obj forKey:key];
}];
return differenceDictionary;
}
@end
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