Introduction
In the previous chapter, you were introduced to the many data types supported by the JavaScript language and runtime, including functions, JavaScript's most impressive first-class data type. Understanding the differences between data types is an important first step for building practical, efficient, and bug-free applications. Software applications have many forms and may have many uses. In its simplest form, an application may read parameters on execution, process the data, and return a response. It may not even interact with any other applications or outside services. Terminal commands are a good example of this. For instance, executing dir in a Windows command window or ls in a Linux Terminal would simply read the contents of a directory on the hard disk and display the details of those files and directories within the Terminal window. The Linux operating system is built on the premise of such very small and simple applications working together to create a much...