The phrase programming language is a fuzzy term that refers to a variety of different ways to tell a computer what to do. In other words, the runtime environment turns an application from a set of instructions into something that performs actual work. In others, they let the operating system interpret and understand what the application is doing. In some cases, these tools let the application interact with the outside world. A runtime environment is an execution environment that lets an application program access system resources and provides the tools the application needs to operate. Runtime EnvironmentsÄepending on the problem domain and environment, applications must access various resources provided by the machine, such as networking infrastructure, RAM, sensors, and the GPU to do useful work. In this chapter, we'll show you how to run JavaScript, determine what the community coding conventions are, and where to go for help and documentation. You can jump into your browser console and start writing JavaScript right now! However, a bit of preparation goes a long way, and learning some background should make your JavaScript journey a rewarding and productive experience.
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