JSFiddle - React, Tailwind, and code Playground

JavaScript

function toString() {
    return '[' + this.name + ',' + this.age + ']';
}
 
var p1 = {
    name     : 'Justin', 
    age      : 35,
    toString : toString
};
 
var p2 = {
    name     : 'momor', 
    age      : 32,
    toString : toString
};
 
console.log(p1.toString()); 
console.log(p2.toString());