A programming language is a formal language comprising a set of strings that produce various kinds of machine code output. Programming languages are one kind of computer language, and are used in computer programming to implement algorithms. Most programming languages consist of instructions for computers.

What programming language uses this?

The keyword this is a Java language keyword that represents the current instance of the class in which it appears. It is used to access class variables and methods. Since all instance methods are virtual in Java, this can never be null.

How do I know what coding language something is?

Go to command line and run bundle install (must be in your application's directory). Then run linguist app/test. tpl (more generally linguist <path-to-code-snippet-file> ). It will tell you the type, mime type, and language.