[swift-evolution] constant var

[Joe Groff]

> On Dec 11, 2017, at 11:34 PM, Inder Kumar Rathore . via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Hi All,
> Today I was writing code and faced a situation where I need to make a instance variable a const i.e. it shouldn't accept new values from anywhere but the problem is that I want it's content to be mutable.
> 
> e.g.
> 
> class MyClass {
>   var myDict = [String : String]()
> }

You can do this by making the setter private:

class MyClass {
  private(set) var myDict = [String: String]()
}

This will allow declarations inside the MyClass definition to modify myDict, but not code outside the class definition.

-Joe