Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
class Human{
  constructor(){
    this.gender = 'male';
  }
  printGender(){
    console.log(this.gender);
  }
}
class Person extends Human{
  constructor(){
    super();
    this.nome = 'Mario';

  }
  printmyname(){
    console.log(this.nome);
  }
}
const person = new Person();
person.printmyname();
person.printGender();
</script>


<script id="jsbin-source-javascript" type="text/javascript">class Human{
  constructor(){
    this.gender = 'male';
  }
  printGender(){
    console.log(this.gender);
  }
}
class Person extends Human{
  constructor(){
    super();
    this.nome = 'Mario';

  }
  printmyname(){
    console.log(this.nome);
  }
}
const person = new Person();
person.printmyname();
person.printGender();</script></body>
</html>