dynamic_method_invocation

📨 Dynamic Invocation with send and public_send

Dynamically calling methods by name is powerful for implementing flexible APIs, delegates, or command patterns. Use public_send to avoid bypassing visibility constraints, and fall back to send only when you must access private or protected methods. Always check respond_to? to handle missing methods gracefully.

class Printer
  def format(text); "<<#{text}>>"; end
  private
def secret; "42"; end
end

p = Printer.new
if p.respond_to?(:format)
  puts p.public_send(:format, "Hello")  #=> <<Hello>>
end

# Access private method only if you really need to
puts p.send(:secret)  #=> "42"