As with most script/code editing applications, this one also tries to mimic the editing style of Microsoft Visual Studio. So, it uses auto-complete, which lists all functions and variables in a small menu while you are typing, and you can select the function or variable you need. This reduces how much you need to type and makes the program more interactive. Also, different types program code like keyword, identifiers, literals, operators and punctuations are easily identifiable because, they are automatically given separate colors.
It also has option for debugging with options "Step Over", "Step Into", etc.
"Script UI Classes" lists all the classes and its properties (variables), and methods (functions), with a short description. But there are no code examples.
Overall, this program is quite good for advanced javascipt editing with some limitations.