Get set in Ruby

In Ruby, get/set methods are often used to access and modify data encapsulated within a class. These methods allow you to control how the data is accessed or modified, and can help ensure data integrity within your program.

Here's an example of how to use get/set methods in a Ruby class:

class Person
  def initialize(name, age)
    @name = name
    @age = age
  end
  
  def name
    @name
  end
  
  def age=(new_age)
    if new_age >= 0
      @age = new_age
    else
      puts "Invalid age input"
    end
  end
end

In this example, we have a Person class with an initialize method that sets the @name and @age instance variables. We then define two get/set methods using the name and age= syntax, respectively.

The name method is a simple get method that returns the value of the @name variable. The age= method is a set method that accepts a new age as an argument and verifies that the age is not less than 0. If the age is valid, it sets the @age variable to the new age. If the age is invalid, it prints an error message.

Here's an example of how we can use the Person class:

p = Person.new("Alice", 25)
puts p.name   # Output: "Alice"
p.age = -5    # Output: "Invalid age input"
puts p.age    # Output: 25
p.age = 30
puts p.age    # Output: 30

In this example, we create a Person object with a name of "Alice" and age of 25. We then use the name method to output "Alice", and attempt to set the age to "-5". The age= method recognizes that the input is invalid and prints an error message. We then set the age to 30 and output the new value of @age.

Overall, get/set methods can be a powerful tool for controlling access to data within your Ruby class, and can help maintain the integrity of your program.