JSFiddle - React, Tailwind, and code Playground

JavaScript

var mainObj = {
  person: 'John',
  age: 25,
  print: function() {
    console.log('Name: ' + this.person + ' Age: ' + this.age);
  }
}

var obj = {
  person: 'Smith',
  age: 26
};

mainObj.print(obj);
mainObj.print.call(obj);