Initializes a newly allocated mutable dictionary, allocating enough memory to hold
- iOS 2.0+
- macOS 10.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
The initial capacity of the initialized dictionary.
An initialized mutable dictionary, which might be different than the original receiver.
Mutable dictionaries allocate additional memory as needed, so
num simply establishes the object’s initial capacity.
This method is a designated initializer of