how to make a class method in es6 syntax code example

Example 1: javascript class

// Improved formatting of Spotted Tailed Quoll's answer
class Person {
	constructor(name, age) {
		this.name = name;
		this.age = age;
	}
	introduction() {
		return `My name is ${name} and I am ${age} years old!`;
	}
}

let john = new Person("John Smith", 18);
console.log(john.introduction());

Example 2: es6 class example

class Polygon { 
   constructor(height, width) { 
      this.height = height; 
      this.width = width; 
   } 
}