Visitor Design Pattern: Code Tour Guide for Navigating Objects

Hey code explorers! Ever wished your code could take a guided tour through different objects, each showcasing its unique features? The Visitor Design Pattern is like having a friendly tour guide – it lets you define a new operation without changing the classes of the elements on which it operates. It's the ultimate exploration tool for your code, ensuring you can wander through diverse objects without disturbing their structure. Let's embark on a code adventure together!

Concept:

• Visitor: Your code tour guide, defining operations to be performed on elements.
• Element: The tour locations, accepting the visitor and letting it operate on itself.
• ConcreteVisitor: Different types of tour guides, each offering a unique perspective.
• ConcreteElement: Distinct tour locations, accepting different types of visitors.
• Client: You, the curious traveler, navigating through this coding exploration.

Ruby Code Expedition:

Let's set sail on a Ruby adventure that's as thrilling as a treasure hunt and as delightful as a scenic tour.

Visitor:

# Your code tour guide - the Visitor
class CodeTourGuide
  def visit(element)
    raise NotImplementedError, 'Subclasses must implement the visit method'
  end
end

Element:

# The tour locations - the Element
class TourLocation
  def accept(visitor)
    raise NotImplementedError, 'Subclasses must implement the accept method'
  end
end

ConcreteVisitor:

# Different types of tour guides - the ConcreteVisitor
class CasualTourist < CodeTourGuide
  def visit(element)
    puts "Casual tourist exploring #{element.class.name}!"
  end
end

class HistoryBuff < CodeTourGuide
  def visit(element)
    puts "History buff diving into #{element.class.name}'s past!"
  end
end

ConcreteElement:

# Distinct tour locations - the ConcreteElement
class Museum < TourLocation
  def accept(visitor)
    visitor.visit(self)
  end
end

class Zoo < TourLocation
  def accept(visitor)
    visitor.visit(self)
  end
end

Code Tour Script:

# The curious traveler's script
casual_tourist = CasualTourist.new
history_buff = HistoryBuff.new

museum = Museum.new
zoo = Zoo.new

# Let the code tour begin!
puts 'Casual Tourist Exploring:'
museum.accept(casual_tourist)

puts "\nHistory Buff Diving into:"
zoo.accept(history_buff)

Why It's a Code Expedition:

The Visitor Design Pattern is like going on a code expedition with a friendly tour guide. It allows you to explore diverse objects without changing their structure, making your coding journey a delightful exploration. So, whether you're a casual tourist or a history buff, the Visitor Pattern is your code tour guide. Explore on, code adventurers, explore on! 🌍✨