Bang Methods in Ruby Language

Bang Methods in Ruby Language :

             Hi today i would like to share some information regarding Bang methods in Ruby. Please take a look at following examples and give a try in rails console.

 name = "JOHN" 
 p string = name.downcase # prints john, doesn't modify name 
 p name # name is still JOHN          

Method which ends with exclamation mark in ruby is called as bang methods.
         
name = "JOHN" 
p name.downcase! # prints john,modify name 
p name # name becomes john after calling bang method