add a setter to a class in ruby

To add a setter to a class in Ruby, you can use the attr_writer method, which creates a public setter method for an instance variable of a class.

Here's an example:

main.rb
class Person
  attr_writer :name
end

person = Person.new
person.name = "John"
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In this example, we defined a Person class with an instance variable @name. The attr_writer method creates a public setter method name= for this instance variable.

Now, we can create a new instance of the Person class and use the setter method name= to set the @name value of the instance to "John".