React Classes refresh

.js

class Human {
  constructor() {
    this.gender = 'female'
  }
  
  printGender() {
    console.log(this.gender)
  }
}

class Person extends Human {
  // Constructors are executed, whenever the class is instantiated
  constructor() {
    super();  // super keyword executes the parent constructor if you are extending a class.
    this.name = 'Robin'
  }
  
  printName() {
    console.log(this.name);
  }
}

// Person instance
const person = new Person()
person.printName();   // "Robin" 
person.printGender()   // "female"