typescriptinheritanceprivate-methods

How to make an inherited method private in extended class

I want to make an inherited method private outside of the extended class in Typescript

Let's say I have two classes like this:

class BaseClass{
    constructor(){}

    sayHello(){
        console.log('hello');
    }
}

class Class extends BaseClass{
    constructor(){
        super();
    }

    private sayHello(){  //I don't want to have to do this every time
        super.sayHello(); 
    }
}

let obj = new Class();
obj.sayHello();

I need to access the method sayHello() inside of 'Class' but it shouldn't be accessible from outside. I don't want to have to overwrite it every time I inherit.

Solution

  • I think you are looking for the protected access modifier. A protected member is accessible from derived classes but not from outside the class

    class BaseClass{
    constructor(){}

    protected sayHello(){
        console.log('hello');
    }
}

class Class extends BaseClass{
    constructor(){
        super()
        this.sayHello() // ok
    }
}

let obj = new Class();
obj.sayHello(); //err