#       
#  Overview
In Ruby, we can permanently delete characters from a string by using the `string.delete` method. It returns a new string with the specified characters removed.

#       
## Syntax
```ruby
str.delete! other_string
```

##      
## Parameters
`str`: this is the string from which we want to delete some characters permanently.

`other_string`: this is a mandatory string that contains the specified characters we want to delete from `str`.

## Return value
The value returned is a string that does not contain the characters specified to remove. If `str` is not modified by this method, nothing or nil is returned.

## Code Example


# create some strings
str1 = "Edpresso"
str2 = "is"
str3 = "awesome"

# delete some characters
str1.delete! "es"
str2.delete! "s"
str3.delete! "ew"

# print modified strings
puts str1
puts str2
puts str3

## Explanation
* **Line 1-4**: We create the strings `str1`, `str2`, `str3`.
* **Line 7-10**: We use the `delete` method and pass strings that contain the characters we want to delete.
* **Line 12-15**: We print the modified strings. As we can see when we run the code, the specified characters are permanently deleted from the strings.

How to permanently delete characters from a string in Ruby

Permanently delete characters from a string in Ruby using `string.delete!`, which modifies the original string.