How to make properties private despite interface?

Question

I have declared interface:

interface IMenu {
    name: string;
    url: string;
}

And class that realizes this interfaace:

class Menu implements IMenu {
    public name;
    public url;
}

Such as properties in interface are always public, it means class that realizes this interface must contain public properties. Is it possible to make them protected or private?

Possible duplicate of https://stackoverflow.com/questions/7767024/why-c-sharp-compiler-does-not-allows-private-property-setters-in-interfaces — Jay Buckman, Feb 07 '19 at 14:18

score 2 · Accepted Answer · answered Feb 07 '19 at 14:18

2

There is no way to do this. Interface implementations must be public (some languages allow a bit of hiding, such as C# with explicit interface implementations but the implemented properties are still accessible from outside the class).

answered Feb 07 '19 at 14:18

Titian Cernicova-Dragomir

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score 0 · Answer 2 · answered Feb 07 '19 at 14:21

interface IMenu {
    name: string;
    url: string;
}

class Menu implements IMenu {
    private _name: string;
    private _url: string;

    constructor() {
        _name = "name";
        _url = "url";
    }

    get name(){
        // your implementation to expose name
    }

    set name(value){
        // your implementation to set name         
    }
 }

You can define Getter and Setter for make Public variable from Interface Private/Protected on a class.

How to make properties private despite interface?

2 Answers2