# Tuesday: Methods

# Messages
# Methods aren't actually called directly on an object.
# A message is sent to the *receiver*, which then looks for a method with that message name.

# When you call a method, it looks a little more like this on the back end:

# call
receiver.my_method

# explicit
receiver.send(:my_method) #send message
receiver.method(:my_method).call #find method on receiver and call it

# Method Clashing

# If a method is defined anywhere in the object chain, method_missing won't catch it.
# There are two ways to undefine a method

class K
end

k = K.new
k.class # => K

class K
  instance_methods.each do |m|
    undef_method(m) if m == :class
  end
end

k = K.new
k.class

k.class # => undefined method 'class'

class J
  def class
    puts 'JJ'
  end
end

j = J.new
j.class # => JJ

class J
  instance_methods.each do |m|
    remove_method(m) if m == :class
  end
end

j = J.new
j.class # => J