What is the purpose of the initialize method in Ruby?

The initialize method is a special method in Ruby that is automatically called when an object is created. It can be used to set up or initialize any variables that the object will need when it is created.

For example, if you were creating a class to represent a Person, you might use the initialize method to set the person’s name and age:

class Person
def initialize(name, age)
@name = name
@age = age

person = Person.new(“John”, 30)
puts person.inspect #

What is the purpose of the super keyword in Ruby?

The super keyword in Ruby is used to call a method from a parent or superclass. This is useful when you want to override a method in a subclass and still access the original method.

For example, say you have a superclass called Animal and a subclass called Cat. The Animal class has a method called speak that prints out “Meow”.

class Animal
def speak
puts “Meow”

class Cat Purr
# => Meow

What is the difference between a class and a module in Ruby?

A class is an object-oriented programming construct that is used to define a type of object. It defines both the data and the behavior of the objects of that type. Classes are the building blocks of object-oriented programming.


class Dog
attr_accessor :name, :breed
def initialize(name, breed)
@name = name
@breed = breed

A module is a collection of methods and constants that can be included in classes. It is used to provide a namespace and prevent name clashes between similarly named methods.


module Dog
def bark
puts “Woof!”

What is the Virtual DOM?

The Virtual DOM is an in-memory representation of the actual DOM (Document Object Model). It is a lightweight, tree-like structure that is used to store the current state of the DOM. It is a copy of the actual DOM, and is used to compare the current state of the DOM with the desired state. Whenever a change is made to the DOM, the Virtual DOM updates itself to reflect the changes.

For example, when a user adds a new element to the DOM, the Virtual DOM updates itself to include the new element. Similarly, when the user removes an element from the DOM, the Virtual DOM updates itself to remove the element from its representation. This helps to reduce the amount of time required to update the actual DOM, as the Virtual DOM can be updated much faster than the actual DOM.

How do you set up a Vue.js project?

1. Install the Vue CLI

The Vue CLI (command line interface) is the easiest and most powerful way to set up a new Vue project. To install it, open a terminal and run the following command:

$ npm install -g @vue/cli

2. Create a new project

Once the Vue CLI is installed, you can create a new project by running the following command:

$ vue create my-project

3. Serve the application

Once the project is created, you can serve it in development mode by running the following command:

$ cd my-project
$ npm run serve

This will start a local development server and open the application in your default browser.

4. Build the application

Once you are ready to deploy your application, you can build it for production by running the following command:

$ npm run build

How does Vue.js compare to other frameworks?

Vue.js is a progressive JavaScript framework that is designed to be approachable and versatile. It is similar to other popular frameworks like React and Angular, but with a few key differences.

Vue.js is more lightweight and focuses on the view layer of an application. It is designed to be easy to use and understand, making it a great choice for developers of all skill levels. Additionally, Vue.js is highly performant and has a small footprint, making it a great choice for mobile and web applications.

Unlike React and Angular, Vue.js comes with its own template language, allowing developers to write HTML-like syntax in their templates. It also supports two-way data binding, making it easier to keep the view and the model in sync. Additionally, Vue.js offers a number of features like components, mixins, and directives to help developers create rich and interactive user interfaces.

Overall, Vue.js is a great choice for developers looking for a lightweight and versatile framework that is easy to use and understand. It is a great choice for both mobile and web applications, and its features make it a great choice for developers of all skill levels.

What are the main features of Vue.js?

1. Reactive Interfaces: Vue.js uses a reactive data-binding system that helps to keep the data and the UI in sync. This means that when data in the model changes, the UI will automatically update to reflect the changes. For example, if you have a list of items and you want to add a new item to the list, you can use Vue.js to bind the data and the UI so that when you add the new item to the list, the UI will automatically update to show the new item.

2. Virtual DOM: Vue.js uses a virtual DOM to make changes to the DOM more efficient. This means that when changes are made to the data, the virtual DOM will update instead of the real DOM, which makes the changes faster and more efficient.

3. Component-Based Architecture: Vue.js uses a component-based architecture, which means that you can create custom components and reuse them in different parts of your application. This makes it easier to create complex applications as you can break down the application into smaller, more manageable components.

4. Animations and Transitions: Vue.js makes it easy to add animations and transitions to your application. You can use the built-in transition components or create your own custom transitions. This makes it easy to create smooth, engaging user experiences.

5. Routing: Vue.js provides a built-in router that makes it easy to create single-page applications with multiple views. This makes it easy to create complex applications with multiple views and multiple routes.

What is the purpose of the ‘this’ keyword?

The ‘this’ keyword is used to refer to the current object in a method or constructor. It can be used to access the object’s properties and methods.

For example,

class Car {
constructor(make, model, color) {
this.make = make;
this.model = model;
this.color = color;

getCarInfo() {
return `This car is a ${this.make} ${this.model} in the color ${this.color}.`;

const myCar = new Car(‘Honda’, ‘Civic’, ‘red’);

// Output: This car is a Honda Civic in the color red.