In cases where they are the same, for instance declaring: const int x = oldX + 5;

vs

immutable int x = oldX + 5;

Or in non-class, non-array function parameters, does it make a difference which is used?

Sean Eskapp Wrote:

> In cases where they are the same, for instance declaring: const int x = oldX + 5;
> 
> vs
> 
> immutable int x = oldX + 5;
> 
> Or in non-class, non-array function parameters, does it make a difference which is used?

Use immutable, it documents the type better. And const items cannot be used as immutable parameters (value types don't have such restriction).