# 
## Overview
We can change lowercase characters in a string in Ruby to uppercase characters and vice versa using the `swapcase` method.

## Syntax
```ruby
str.swapcase
```
## Parameters
**str**: This is the string whose characters' cases we want to swap.

## Code example


# creates some strings
str1 = "edpresso"
str2 = "IS"
str3 = "awESoMe"

# swap cases
puts str1.swapcase
puts str2.swapcase
puts str3.swapcase


## Explanation
* **Lines 2 to 4**: Several strings `str1`, `str2`, and `str3` are created and initialized with some values.
* **lines 7 to 9**: The `swapcase` method is called on the strings we create. We then print the result.

How to swap cases in a string in Ruby?

The swapcase method in Ruby changes lowercase characters to uppercase and vice versa in a string.