IncludeDirectories
is an option that specifies whether directories are included in evaluations.
Details

- With the default setting IncludeDirectoriesFalse, directories are excluded from evaluations.
- With the setting IncludeDirectoriesTrue, functions like FileSystemMap will apply to both directories and files.
Examples
Basic Examples (1)
By default, FileSystemMap excludes directories:
When IncludeDirectories is set to True, a key of All will be added for the evaluated directory:
Wolfram Research (2019), IncludeDirectories, Wolfram Language function, https://reference.wolfram.com/language/ref/IncludeDirectories.html.
Text
Wolfram Research (2019), IncludeDirectories, Wolfram Language function, https://reference.wolfram.com/language/ref/IncludeDirectories.html.
CMS
Wolfram Language. 2019. "IncludeDirectories." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/IncludeDirectories.html.
APA
Wolfram Language. (2019). IncludeDirectories. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/IncludeDirectories.html