A class method is essentially the c# equivalent of a "static method". A good example would be a "calculator" class, where you have a "class method" called "add" which adds 2 numbers together.
In this situation, it makes no sense to create a "calculator" object and then use the "add" method. Instead we would want to use the "add" method directly.
To define a class-method, we once again make use of the "self" keyword:
class Calculator
def self.add(first_number,second_number)
first_number + second_number # remember the output is automatically returned.
# You don't need to explicitly state a return statement
end
end
result = Calculator.add(2,5) # here we are just drilling down to the class
# that has the "add" method, similar to c#.
puts "The sum of 2 and 5 is: #{result}"