Chapter 18 Creating New Formats
The rmarkdown package has included many built-in document and presentation formats. At their core, these formats are just R functions. When you include an output format in the YAML metadata of a document, you are essentially specifying the format function to call and the parameters to pass to it.
We can create new formats for R Markdown, which makes it easy to customize output formats to use specific options or refer to external files. Defining a new function can be particularly beneficial if you have generated a new template as described in Chapter 17, as it allows you to use your custom templates without having to copy any files to your local directory.