coolbrg

class ClassMethodDemo
  def self.greet
    puts "Hello, Ruby"
  end
end
ClassMethodDemo.greet

coolbrg

class ClassMethodDemo
  def self.greet
    puts "Hello, Ruby"
  end
  ClassMethodDemo.greet
end

coolbrg

class ClassMethodDemo
  def self.greet
    puts "Hello, Ruby"
  end
  greet
end

coolbrg

class ClassMethodDemo
  def self.greet
    puts "Hello, Ruby"
  end
end

class UseDemo < ClassMethodDemo
  greet
end

coolbrg

module Aa
  def a_foo
    puts "A's foo"
  end
end

module Bb
  def b_foo
    puts "B's foo"
  end

coolbrg

class Mammal  
  def breathe  
    puts "inhale and exhale"  
  end  
end  
  
class Cat < Mammal  
  def speak  
    puts "Meow"  
  end  

coolbrg

class SelfDemo
  def foo(val)
    @value = val
    bar
  end

  def bar
    puts @value
  end
end

coolbrg

def lambda_test
  lam = lambda { return }
  lam.call
  puts "Hello world"
end

puts "Lambda Test : #{lambda_test }"

def proc_test
  proc = Proc.new { return }

coolbrg

class Fixnum
  def hours
    self * 3600
  end
  def from_now
    Time.now + self
  end
end

coolbrg

RUBY_EXPERIENCE_POINT = 50

# Student Class
class Student  
  KNOWLEDGE_TARGET = 75  # 75 percentage of cencepts
  DEFAULT_EXPERIENCE_PERCENT = 10

  attr_accessor :enthusiastic, :class_details
  
  def initialize(ruby_experience, enthusiastic)