Dart: Copy with Constructor

In Dart, when we have an object, sometimes we want to create a new version of that object with some changes, while still keeping the original object unchanged.

This is especially useful when dealing with immutable objects, which means objects whose properties cannot be changed once they are set.

To achieve this, Dart provides a pattern called "copy with constructor".

This pattern allows us to make a modified copy of an object while preserving the immutability of the original object.

Here's a simple example demonstrating the "copy with constructor" pattern in Dart:

Inside the copyWith constructor, we use the null-aware operator ?? to provide default values for name and age if they are null.