NSMutableDictionary+NilHandlingDictionary.m

// .h

@interface NSMutableDictionary (NilHandlingDictionary)
-(void)MJNInsertNullIfNilObject:(id)value forKey:(id<NSCopying>)key;
-(void)MJNDoNothingIfNilObject:(id)value forKey:(id<NSCopying>)key;
@end



// .m
@implementation NSMutableDictionary (NilHandlingDictionary)

-(void)MJNInsertNullIfNilObject:(id)value forKey:(id<NSCopying>)key
{
    if (!value) {
        self[key] = [NSNull null];
        return;
    }
    
    self[key] = value;
}

-(void)MJNDoNothingIfNilObject:(id)value forKey:(id<NSCopying>)key
{
    if (!value) {
        return;
    }
    
    self[key] = value;
}

@end