Back-end and JavaScript Development

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Questions and Answers

What is a major benefit of using Node.js for web development?

It is exclusively designed for server-side scripting.
It is faster than all other programming languages.
It eliminates the need for any external libraries.
It enables the use of JavaScript for both client-side and server-side development. (correct)

Which of the following is a common use of client-side JavaScript?

Performing form validation before submission. (correct)
Managing server databases directly.
Creating RESTful API endpoints.
Executing complex algorithms on the server.

What does the Node Package Manager (npm) provide for developers?

A wide range of modules and libraries for enhanced development. (correct)
A built-in code editor for JavaScript.
A framework for building mobile applications.
A way to directly compile JavaScript into machine code.

In the provided client-side JavaScript example, what happens when the 'Click me' button is pressed?

The user is prompted to enter their name, followed by a greeting displayed in an alert. (C) Signup and view all the answers

What is a key characteristic of applications built using Node.js?

They are often high-performance and event-driven. (D) Signup and view all the answers

Which of the following tasks is NOT a primary responsibility of a back-end developer?

Design visual elements of web pages (B) Signup and view all the answers

What is the main purpose of using APIs in back-end development?

To facilitate communication between different software applications (D) Signup and view all the answers

Which of the following languages is NOT commonly used by back-end developers?

HTML (D) Signup and view all the answers

During which phase of web development do back-end developers need to assess performance and scalability?

Once the website is launched (B) Signup and view all the answers

Why is it important for back-end developers to write clean and maintainable code?

To allow for sustainable web application development (B) Signup and view all the answers

Which skill is essential for a back-end developer to successfully troubleshoot issues?

Strong analytic reasoning (B) Signup and view all the answers

What type of testing is specifically mentioned as a responsibility of back-end developers?

Quality assurance testing (C) Signup and view all the answers

Which of the following best describes the primary aim of back-end development?

To manage server-side logic and databases (A) Signup and view all the answers

Which statement accurately describes Node.js's performance characteristics?

Node.js is highly efficient due to its event-driven and non-blocking I/O model. (C) Signup and view all the answers

What is the purpose of the `require()` function in Node.js?

To include built-in or user-defined modules into an application. (A) Signup and view all the answers

Which of the following features contributes to Node.js's scalability?

Node.js uses an event-driven mechanism for responding to requests. (D) Signup and view all the answers

What happens when Node.js applications output data?

They send the data in chunks without holding it in memory. (B) Signup and view all the answers

How do you expose properties or methods in your own Node.js module?

By utilizing the <code>exports</code> keyword for visibility. (C) Signup and view all the answers

Which of these statements is NOT true about Node.js?

Node.js is primarily a client-side JavaScript framework. (B) Signup and view all the answers

In what way does Node.js being open-source benefit developers?

It allows for the continuous development and sharing of modules within the community. (D) Signup and view all the answers

What is the role of the V8 JavaScript Engine in Node.js?

It transforms JavaScript code into machine code for execution. (A) Signup and view all the answers

What is the purpose of the require() method in Node.js?

To include built-in modules or external libraries (A) Signup and view all the answers

In the example provided, what does the statement res.write('Hello World!') accomplish?

It writes a message to the client response (C) Signup and view all the answers

What must be done to run a Node.js application as shown in the examples?

Save the code in a file and run it using node (A) Signup and view all the answers

Which of the following statements is true regarding the HTTP module in Node.js?

The HTTP module is built into Node.js for handling HTTP requests. (B) Signup and view all the answers

What does the method server.listen(port, hostname) accomplish in a Node.js application?

It starts the server and listens for connections on the specified port and hostname. (D) Signup and view all the answers

If the code res.setHeader('Content-Type', 'text/plain') is omitted, what will the client likely receive?

A response with the default content type of text/html (C) Signup and view all the answers

Which port number is commonly used in the examples to initiate a Node.js server?

3000 (B), 8080 (C) Signup and view all the answers

What is the output of the function dt.myDateTime() in the context of the Node.js server?

It returns the current date and time. (B) Signup and view all the answers

What is the purpose of the 'AUTO_INCREMENT' attribute in a database column?

To automatically generate a unique integer for each record. (A) Signup and view all the answers

Which statement correctly describes the function of the 'Events' module in Node.js?

It allows for the creation and management of custom events. (A) Signup and view all the answers

In the provided code to create a 'customers' table, what is the effect of the 'PRIMARY KEY' constraint?

It ensures that all values in the column are unique. (D) Signup and view all the answers

What is the expected output when running 'demo_create_table.js' if the table is created successfully?

Connected! Table created (A) Signup and view all the answers

How does a readStream object in Node.js signal that a file has been opened?

By firing an event using the 'on' method. (C) Signup and view all the answers

Why is it important to specify the database name in a MySQL connection?

It is required to execute SQL queries correctly. (B) Signup and view all the answers

What will happen if the connection fails in the provided MySQL code?

An error will be thrown and the program will terminate. (D) Signup and view all the answers

What JavaScript method is used to include the built-in 'mysql' module for database operations?

require() (B) Signup and view all the answers

Study Notes

Back-end Development

Back-end development focuses on server-side software, which is not visible to users.
Back-end developers work on databases, application programming interfaces (APIs), architecture, and servers.
Responsibilities include building and maintaining websites, writing high-quality code, performing quality assurance (QA) testing, assessing efficiency, troubleshooting and debugging, and providing training and support.
Back-end developers often use languages like Python, Java, and Ruby.
They ensure the smooth operation and performance of websites, responding to user requests from the front-end.

Client-side JavaScript

Client-side JavaScript enhances webpage functionality and interactivity without server communication.
This includes tasks like form validation, dynamic content updates, and user interface improvements.

Server-side JavaScript

Node.js is a runtime environment that executes JavaScript code outside of a web browser.
It allows developers to build scalable applications with high performance and event-driven capabilities.
Node.js provides a unified JavaScript experience for both client and server, enabling code reuse and improving development efficiency.
It has a vast ecosystem of modules and libraries, including web frameworks, database connectors, authentication solutions, and testing tools.
Node.js uses an event-driven, non-blocking I/O model, making it lightweight and efficient for real-time data-intensive applications.
It provides a rich set of JavaScript modules to simplify web application development.

Node.js Features

Node.js is built on Google Chrome's V8 engine, making it fast in code execution.
It uses a single-threaded model with event looping.
This allows for high scalability and non-blocking response mechanisms.
Node.js applications don't buffer data and output information in chunks, minimizing processing time.
Node.js is open-source, with a large community contributing modules for enhanced functionality.

Node.js Modules

Modules are similar to JavaScript libraries, providing sets of functions for applications.
Node.js includes built-in modules readily available for use without installation.
To include a module, use the require() function followed by the module's name.
You can also create and include your own modules for specific functionalities.

Node.js HTTP Module

The built-in HTTP module enables Node.js to transfer data using the HTTP protocol.
The createServer() method within the HTTP module creates an HTTP server that listens to ports and responds to client requests.
This allows Node.js to function as a web server.

Creating a Web Server with Node.js

A basic "Hello World" example demonstrates a Node.js web server listening on a specific port.
Node.js applications can connect and interact with databases, like MySQL, using modules.
When creating tables within a database, primary keys are essential for uniquely identifying records.
These are typically defined as "INT AUTO_INCREMENT PRIMARY KEY," automatically generating unique numbers for each record.

Node.js Events

Events in Node.js represent actions on a computer, like connections or file openings.
Objects in Node.js can fire events, such as the readStream object emitting events when opening or closing a file.
Node.js has a built-in "Events" module for creating, firing, and listening to custom events.

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Description

Explore the crucial roles of back-end development and JavaScript in web applications. This quiz covers server-side technologies, client-side interactivity, and the tools and languages used by developers. Test your understanding of how these components work together to create seamless user experiences.