Thanks to expertly crafted libraries such as jQuery and MooTools, JavaScript has become a foundation of Front-End Development. However, it’s extremely important that we note the higher level concepts utilized in these wonderful libraries. Why is that? As web developers, we must equally balance learning the current programming trends with attempts to push the boundaries of those trends. Without this balance, no innovation will occur in web development. So let’s take a moment to appreciate the fundamentals of JavaScript Object Oriented Programming, which include classes, inheritance, and scope.