Ruby On Rails Questions et reponses d'entretien
Question 61. What is an object?
Textbook answer here is that an object is an instance of a class and has state, behavior, and identity. In a plain text example, you can say that a truck and a car are both objects of the class Vehicle, or that apple and pear are both objects of the class Fruit.
Question 62. How would you declare and use a constructor in Ruby?
Constructors are declared via the initialize method and get called when you call on a new object to be created.
Question 63. How does a symbol differ from a string?
Symbols are immutable and reusable, retaining the same object_id.
Question 64. How and when would you declare a Global Variable?
Global variables are declared with the ‘$’ symbol and can be declared and used anywhere within your program. You should use them sparingly to never.
Question 65. How would you create getter and setter methods in Ruby?
Setter and getter methods in Ruby are generated with the attr_accessor method. attr_accessor is used to generate instance variables for data that’s not stored in your database column.
Les plus utiles selon les utilisateurs :
- What is Ruby On Rails?
- Why Ruby on Rails?
- Explain how (almost) everything is an object in Ruby.
- What are Gems and which are some of your favorites?
- How would you declare and use a constructor in Ruby?