# 
## Overview

We can check if there are no environment variables using the `empty?` property of the `ENV` class. It returns `true` if the environment variables are available, otherwise, it returns a `false`.
## Syntax
```ruby
ENV.empty?
```

## Return values

The value returned is a Boolean. It returns `true` if there are environment variables available, otherwise, it returns `false.

## Code example

# create some environment variables
ENV["G"] = "Google"
ENV["N"] = "Netflix"
ENV["A"] = "Apple"
ENV["A"] = "Amazon"
ENV["M"] = "Meta"
ENV["FOO"] = ""

# check if empty
puts ENV.empty?  # false

# clear environment variables
ENV.clear

# check if empty
puts ENV.empty?  # true

## Code explanation

* **Lines 2 to 7**: We create some environment variables.
* **Line 10**: We check if there are environment variables present and print the result.
* **Line 13**: We clear all environment variables.
* **Line 16**: We recheck if the environment variables exist and print the result to the console.

How to check if there are no environment variables in Ruby

Use the `ENV.empty?` method to check for environment variables in Ruby.