gistfile1.js

var results = [],
code = 'new Person("Elijah", "Grey")';
 
function Person(firstname, lastname) {
    this.name = {
      first: firstname,
      last: lastname
    };
}
results.push(code + " == " + eval(code));
results.push("("+ code + ").toString(true) == "+eval(code).toString(true));
 
Person.prototype.toString = function() {
    return this.name.first + " " + this.name.last;
};
results.push(code + " == " + eval(code));
 
alert(results.join("\n\n"))