Under a new draft specification, C# and VB will be adding what they are calling a “record class”. This is essentially an immutable class defined solely by its constructor.

In C#, the readonly keyword can only be used at the field level. Under proposal 115, Readonly for Locals and Parameters, this would be extended to cover a many more scenarios.

What does immutable class actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.