idiomatic ruby

[TOC]

use `!` for "inplace" String manipulation

Use ! at the end of the method name to do an "inplace" change in a String

>> name = "meleu"
=> "meleu"
>> name.capitalize
=> "Meleu"
>> name
=> "meleu"
>> name.capitalize!
=> "Meleu"
>> name
=> "Meleu"
>> name.upcase
=> "MELEU"
>> name
=> "Meleu"
>> name.upcase!
=> "MELEU"
>> name
=> "MELEU"

references