object1.prototype.isPrototypeOf(0bject2);

function Person() {
  this.name = "Rob Roberson";
  this.age = 31;
}

function Employee() {
  this.dept = "HR";
  this.manager = "John Johnson";
}

Employee.prototype = new Person();

var Ken = new Employee();

Ken is in the prototype chain of Employee, Person, and Object. Prove it to yourself by clicking on each class. They alert Employee.prototype.isPrototypeOf(Ken), Person.prototype.isPrototypeOf(Ken), and Object.prototype.isPrototypeOf(Ken), respectively.

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