JSFiddle - React, Tailwind, and code Playground

JavaScript

class A {
    a( callback ){
      console.log('a');
      callback();
    }

    b(params){
      console.log('b');
    }

    c(params) {
      this.a( () => this.b() ); 
    }
}

const myClass = new A();
myClass.c();