Variable Naming

Rubyists follow a set of variable-naming conventions and rules:

• Variable names should be written in snake case, i.e., with all lowercase letters and with underscores replacing spaces (e.g., my_snake_case_variable).
• Variable names cannot have special characters (e.g., *, ", [, !, ?, ,).
• Variable names cannot be one of the following Ruby keywords, which are reserved for special purposes:

__FILE__  and    def       end     in      or      self   unless
__LINE__  begin  defined?  ensure  module  redo    super  until
BEGIN     break  do        false   next    rescue  then   when
END       case   else      for     nil     retry   true   while
alias     class  elsif     if      not     return  undef  yield

Give variables descriptive names. A variable named car_model that refers to the value "Prius" is more readable than p or string. Your code should be as comprehensible as possible.