Copy.js

class Counter {
	constructor() {
    	this.counter = 2
      	this.info = {name: 'abhinav', age: 29}
    }

	add () {
    	this.counter += 1
    }
  
  	copy () {
    	var copy = new Counter()
        Object.keys(this).forEach((key) => {
        
        	switch(typeof this[key]) {
              case 'object':
                copy[key] = JSON.parse(JSON.stringify(this[key]))
                break
              default:
              	copy[key] = this[key]
                
            }
        })
      
      	return copy
    }

}

var counter1 = new Counter()
var counter2 = counter1.copy()