class declaration in javascript

1class Person {
2 constructor(name, age) {
3   this.name = name;
4   this.age = age;
5 }
6  present = () => { //or present(){
7  	console.log(`Hi! i'm ${this.name} and i'm ${this.age} years old`) 
8  }
9}
10let me = new Person("tsuy", 15);
11me.present();
12// -> Hi! i'm tsuy and i'm 15 years old.

1class Rectangle {
2  constructor(height, width) {
3    this.height = height;
4    this.width = width;
5  }
6  // Getter
7  get area() {
8    return this.calcArea();
9  }
10  // Method
11  calcArea() {
12    return this.height * this.width;
13  }
14}
15
16const square = new Rectangle(10, 10);
17
18console.log(square.area); // 100