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

If you really don't care if it's mutable, but want to mutate it anyway, you could try this:

NSString* value = @"value";
NSString* key = @"key";

NSDictionary* bar = [NSDictionary dictionary];
NSLog(@"bar desc: %@", [bar description]);
NSMutableDictionary* temp = [bar mutableCopy];
[temp setValue:value forKey:key];
bar = temp;
NSLog(@"bar desc: %@", [bar description]);