Class Methods

Class methods belong to the class itself and are called without creating an object first.

class_methods.rb

class Grade
  def self.passing?(score)
    score >= 70
  end

  def self.label(score)
    passing?(score) ? "pass" : "review"
  end
end

score = 

puts "score=#{score}"
puts "status=#{Grade.label(score)}"

class Grade
  def self.passing?(score)
    score >= 70
  end

  def self.label(score)
    passing?(score) ? "pass" : "review"
  end
end

score = 

puts "score=#{score}"
puts "status=#{Grade.label(score)}"

class Grade
  def self.passing?(score)
    score >= 70
  end

  def self.label(score)
    passing?(score) ? "pass" : "review"
  end
end

score = 

puts "score=#{score}"
puts "status=#{Grade.label(score)}"

class method A method defined as `self.method_name` is called on the class rather than on an instance.