Calling class functions from another class function with JavaScript-CodePudding

I have this code here: what I am trying to do is call function 'counterAdder' that lives in class A from the class B.

Then I am supposed to create an instance of A and an instance of B, then call the 'counterAdder' function which updates the instance of A's 'counter' item.

When I run this code, it outputs as 0 but I need 1.

class A {
     constructor(){
          this.counter = 0;
     }
}

class B{
     constructor(){
     }
     counterAdder(){
          A.counter  =1;
     }
}

const a = new A();
const b = new B();

b.counterAdder();

console.log(a.counter) // => 1

I can't seem to figure out how to get 'a' to update when an action from 'b' is run.

I am unable to modify anything outside of class A and class B and only using pure JavaScript.

CodePudding user response：

The following code:

counterAdder(){
          A.counter  =1;
}

does not do what you are trying to do. Instead it adds a new property (or something else, I'm not exactly sure why it even works in the first place). What you want to do is modify the counter of a, the variable you assigned to A. So instead do this:

counterAdder(){
          a.counter  =1;
}