This course is designed to teach web developers how to utilize the various object-oriented programming features within JavaScript. Object-oriented programming allows developers to build applications with reusable and maintainable blocks of code, which leads to efficiency and simplified software design.With object-oriented JavaScript, you'll be able to build classes to construct objects that encapsulate both data and functionality. You'll also learn how to leverage prototypal inheritance to maintain DRY code, allowing you to pass behaviors down to objects. You'll also learn how to keep data safe and secure by creating private state with closures and immediately-invoked function expressions.