Has method in Ruby

In Ruby, we can use the respond_to? method to check if a class has a certain method. respond_to? returns true if the object can respond to the message and false otherwise.

Here's an example of how to use respond_to?:

class Person
  def name
    puts "John"
  end
end
person = Person.new
# Check if the person object has a method named "name"

if person.respond_to?("name")

  person.name

else

  puts "Method not found"

end

In this example, we created a Person class with a name method. We then created a person object and checked if it has a method named "name" using respond_to?. Since the person object has a name method, we output "John".

We could also use the shorthand version of respond_to? by passing a symbol of the method name:

if person.respond_to?(:name)
  person.name
else
  puts "Method not found"
end

This does the same thing as the previous code block, but uses a symbol instead of a string in the argument to respond_to?.