Ruby Naming Convention > Variable Naming

snake_case

Should be all in lowercase
Not begin with the special characters like e.g. & (ampersand), $ (dollar)
If the name contains multiple words, it should be separated by underscores (_) e.g. json_string
Avoid one-character variables e.g. a, b
Clear and descriptive variable names without abbreviations are preferred.

  first_name = "Hanz"

The above is an example of a local variable.

Instance variables are prefixed with an '@' and are used in Ruby classes as show below.

class Student
    def initialize(name)
      @name = name
    end

Other prefixes include '$' for global variables, and '@@' for class variables. But when possible, instance and local variables are preferred.