JSFiddle - React, Tailwind, and code Playground

by Oleh Kotsubko

JavaScript

var calculator = {
      read: function() {
      	this.first = +prompt('Первое число', 0);
        this.second = +prompt('Второе число', 0);
   		},
      sum: function() {
      	alert(this.first+this.second);
      }
}
calculator.read();
calculator.sum();