# 
## Overview
We use the **`File.directory?()`** method in **Ruby** to check if a particular file name is a directory. A directory is a folder that holds files in your computer system. 

The `File.directory?()` method returns a Boolean value. If the file name provided is not a directory, it returns a `false` value. Otherwise, it returns a `true` value.

## Syntax
``` ruby
File.directory?(file_name)
```
## Parameters
**`file_name`**: This is the name of the file or symlink that points to a directory.
## Return value
This method returns a Boolean value. If the file name provided is a directory, it returns `true`. If not, it returns `false`.
# Code example

# Get the file names
fn1 = "main.rb"
fn2 = "test1.txt"
fn3 = "."
fn4 = "./"
fn5 = "./test1.txt"

#  Check if the file names are directories
puts File.directory?(fn1) # false
puts File.directory?(fn2) # false
puts File.directory?(fn3) # true
puts File.directory?(fn4) # true
puts File.directory?(fn5) # false

# Explanation
* **Lines 2 to 6**: We create some file name variables. We create a file `test1.txt` and an application code file `main.rb`.
* **Lines 9 to 13**: We check if the file names we created are directories using the `directory?()` method of the file class. Then, we print the results.

What is the File.directory?() method in Ruby?

File.directory?() method in Ruby checks if a file name is a directory, returning true or false.