simple Es6 Class.js

class Human {
  constructor (gender,nationality){
    this.gender = gender;
    this.nationality = nationality;
  }
  
  humanIntro (){
    var sex = this.gender == "female" ? "girl" : "boy";
    return `I'm a ${sex} from ${this.nationality}`;
  }
}

class Person extends Human{
  constructor(name,lastName,gender,nationality){
    super(gender,nationality);
    this.name = name;
    this.lastName = lastName;
  }
  
  introduce (){
    console.log (`${this.humanIntro()} and my name is ${this.name} ${this.lastName}`);
  }
}

let me = new Person("mostafa","Javaheripour","male","Iran");
me.introduce();