What is the step-by-step guide for implementing an access limiter on an interface

When attempting to modify the access level on an interface in Typescript, I encountered an error stating 'cannot appear in type member.' After removing the access limiter on the interface and implementing it, I tried changing the access limiter on the class.

interface car {
  private speed: number;
}

Unfortunately, this did not work as expected.

interface car {
    speed: number;
}

This change did work successfully.

class MyCar implements car {
    private speed: number;
}

However, this did not work as intended.

class MyCar implements car {
    public speed: number;
}

This modification worked properly.

Is it possible for an interface to have an access limiter? Or can an implemented interface restrict access with private or protected levels on a class?

Answer №1

In object-oriented programming, interfaces do not support access modifiers. The purpose of an interface is to outline the public members that a class exposes, while private members are considered implementation details that should be hidden from the public interface.

This limitation is consistent across various modern OOP languages such as C# and Java which also do not permit access modifiers on interfaces.

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