Class body and method definitions
Prototype methods:
class Rectangle {
constructor(height, width) {
this.height = height;
this.width = width;
}
// Getter
get area() {
return this.calcArea();
}
// Method
calcArea() {
return this.height * this.width;
}
}
const square = new Rectangle(10, 10);
console.log(square.area); // 100
Static methods:
class Point {
constructor(x, y) {
this.x = x;
this.y = y;
}
static distance(a, b) {
const dx = a.x - b.x;
const dy = a.y - b.y;
return Math.hypot(dx, dy);
}
}
const p1 = new Point(5, 5);
const p2 = new Point(10, 10);
console.log(Point.distance(p1, p2)); // 7.0710678118654755
Sub classing with extends:
class Animal {
constructor(name) {
this.name = name;
}
speak() {
console.log(this.name + ' makes a noise.');
}
}
class Dog extends Animal {
speak() {
console.log(this.name + ' barks.');
}
}
var d = new Dog('Mitzie');
d.speak(); // Mitzie barks.