iOS — distinguish an NSDictionary from an NSMutableDictionary?

Question

I have the following code fragment:

NSString* value = @\"value\";
NSString* key = @\"key\";
NSMutableDictionary* foo = [NSMutableDictionary dictionary];
NSDictio         


        

Answer 1

I end up using @try catch but it only fires once. So it works like this

NSMutableDictionary *valuesByIdMutable = (id)self.valuesById;

simplest_block block = ^{
    [valuesByIdMutable setObject:obj forKey:key];
};

@try {
    block();
} @catch (NSException *exception) {
    self.valuesById = valuesByIdMutable = [valuesByIdMutable mutableCopy];
    block();
}