# 
#  Overview
**Capitalizing** a string in Ruby means changing the first letter of the string to upper case. The `capitalize` method is useful in this regard. However, `capitalize!` is the best method to change the string permanently.

## Syntax
```ruby
str.capitalize!
```

## Parameters
None.

## Return value
The value returned is the string with its first letter in the upper case.

##
## Code
We will create some strings and capitalize them permanently. See the code example below:


# create strings
str1 = "edpresso"
str2 = "is"
str3 = "the"
str4 = "best"

# capitalize them
a = str1.capitalize!
b = str2.capitalize!
c = str3.capitalize!
d = str4.capitalize!

# print changed strings
puts str1
puts str2
puts str3
puts str4

How to permanently capitalize a string in Ruby

Use capitalize! to permanently change the first letter of a string to uppercase in Ruby.