Back-End Developer Tools and Skills
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Which programming language is NOT traditionally used by back-end developers?

  • PHP
  • HTML (correct)
  • Ruby
  • Python

    • What is the primary function of databases in back-end development?

  • To store and organize client data (correct)
  • To generate web page content
  • To execute client-side code
  • To provide front-end design

    • Which framework is specifically associated with the Python programming language?

  • Ruby on Rails
  • Django (correct)
  • Laravel
  • Spring

    • What knowledge is considered a bonus for back-end developers?

    <p>Front-end languages like HTML, CSS, and JavaScript</p> Signup and view all the answers

    What is an API primarily used for in back-end development?

    <p>Defining rules for application software development</p> Signup and view all the answers

    Which of the following databases is NOT mentioned as popular for back-end development?

    <p>SQLite</p> Signup and view all the answers

    What role do frameworks play in back-end development?

    <p>They assist in developing server configurations</p> Signup and view all the answers

    Which of the following languages is suggested to expand job opportunities for back-end developers?

    <p>JavaScript</p> Signup and view all the answers

    What is one of the primary benefits of Node.js regarding I/O operations?

    <p>It resumes operations when responses are received without blocking the thread.</p> Signup and view all the answers

    Which application type is NOT typically associated with Node.js?

    <p>Traditional multi-threaded desktop applications</p> Signup and view all the answers

    What allows Node.js to support millions of concurrent connections effectively?

    <p>Non-blocking I/O operations.</p> Signup and view all the answers

    Why is Node.js appealing to frontend developers?

    <p>It allows them to write server-side code using JavaScript.</p> Signup and view all the answers

    Which of these features does Node.js offer regarding ECMAScript standards?

    <p>Node.js developers control which ECMAScript version to use.</p> Signup and view all the answers

    Which of the following is a characteristic of Node.js?

    <p>It is open-source and cross-platform.</p> Signup and view all the answers

    What kind of applications is Node.js NOT particularly suited for?

    <p>Computationally intensive scientific simulations</p> Signup and view all the answers

    In what way does Node.js manage thread concurrency?

    <p>By using a single-threaded event loop.</p> Signup and view all the answers

    What is the primary model that Node.js follows in its architecture?

    <p>Event-driven with event looping</p> Signup and view all the answers

    Which engine is Node.js built on to ensure fast code execution?

    <p>Google Chrome's V8</p> Signup and view all the answers

    What function is used to include a module in a Node.js application?

    <p>require()</p> Signup and view all the answers

    What is one of the key advantages of the non-blocking I/O model in Node.js?

    <p>Reduces processing time for I/O tasks</p> Signup and view all the answers

    What is a characteristic feature of Node.js applications regarding data handling?

    <p>They output data in chunks</p> Signup and view all the answers

    What keyword is utilized in Node.js to make a module's properties and methods accessible outside its file?

    <p>exports</p> Signup and view all the answers

    Which of the following statements is true about Node.js modules?

    <p>Node.js has both built-in and user-defined modules.</p> Signup and view all the answers

    Where do you typically define a module's functionalities in Node.js?

    <p>In a JavaScript file</p> Signup and view all the answers

    What is the purpose of the con.connect() method in the MySQL connection code?

    <p>To establish a connection to the MySQL server.</p> Signup and view all the answers

    What SQL statement is used to create a new database in MySQL?

    <p>CREATE DATABASE</p> Signup and view all the answers

    What will happen if an error occurs during database connection?

    <p>Execution will halt and an error will be thrown.</p> Signup and view all the answers

    How is the result of a query retrieved after executing con.query()?

    <p>It is returned through a callback function.</p> Signup and view all the answers

    Which part of the code is responsible for outputting 'Database created' after successful execution?

    <p>The console.log statement within the query callback.</p> Signup and view all the answers

    What is the purpose of the HTTP module in Node.js?

    <p>To transfer data over the Hyper Text Transfer Protocol</p> Signup and view all the answers

    What command is used to initiate a Node.js file called 'demo_http.js'?

    <p>node demo_http.js</p> Signup and view all the answers

    Which line correctly sets the response's content type to plain text in a Node.js server?

    <p>res.setHeader('Content-Type', 'text/plain');</p> Signup and view all the answers

    In a Node.js HTTP server, what does the createServer() method do?

    <p>Creates an HTTP server that listens for requests</p> Signup and view all the answers

    Which port is commonly used in the provided example to listen for incoming HTTP requests?

    <p>8080</p> Signup and view all the answers

    What is the output of the following code snippet when a client accesses the root URL?

    <p>Hello World!</p> Signup and view all the answers

    What will happen if the line 'res.end();' is omitted in a server response?

    <p>The client will not receive any response</p> Signup and view all the answers

    Which of the following statements is true about the 'http' variable in the provided code examples?

    <p>It is a representation of the Node.js HTTP module</p> Signup and view all the answers

    Study Notes

    Back-End Developer Tools

    • Programming Languages:
      • Python, PHP, JavaScript, Ruby, Java, C#
    • Frameworks:
      • Laravel, Django, Spring, Ruby on Rails, Meteor, Node.js
    • Databases:
      • MongoDB, MySQL, Oracle

    Back-End Developer Technical Skills

    • Programming Languages:
      • Skill in Python, Java, and PHP is essential
      • Python is favored for its AI/ML compatibility and clear, logical code
      • Basic knowledge of front-end languages (HTML, CSS, JavaScript) is beneficial
    • Frameworks:
      • Frameworks are libraries for back-end programming languages that aid in server configuration.
      • Knowledge of a framework associated with your preferred language is recommended
    • Databases and Servers:
      • Understanding data storage and retrieval from databases is crucial
      • Popular database programs: MongoDB and MySQL
      • The database organizes and stores client data, similar to cloud storage
      • Data is accessed through a server.
    • Application Programming Interface (API):
      • APIs are sets of rules and definitions for developing application software.
      • Knowledge of JavaScript is valuable for building mobile apps (iOS & Android)

    Client-Side vs Server-Side JavaScript

    • Client-Side JavaScript:
      • Executed within the user's web browser
    • Server-Side JavaScript:
      • JavaScript code executed on the server
      • Enables interaction between server and client
      • Node.js is a widely used server-side JavaScript environment

    Introduction to Node.js

    • Node.js:
      • Open-source, cross-platform JavaScript runtime environment
      • Leverages the V8 JavaScript engine (Google Chrome's core)
      • Handles I/O operations efficiently, allowing it to manage numerous concurrent connections with a single server.
      • Provides a unified platform for front-end and back-end JavaScript development.
      • Offers control over ECMAScript versions and enables experimental features through flags.
      • Primarily utilized for running real-time server applications.

    Node.js Features and Modules

    • Node.js Features:
      • Extremely Fast: Built on Google Chrome's V8 JavaScript Engine, resulting in fast code execution.
      • Single-Threaded: Utilizes a single-threaded model with event looping.
      • Highly Scalable: The event mechanism enables non-blocking server responses, enhancing scalability.
      • No Buffering: Streamlines processing time for audio and video files by avoiding buffering, delivering data in chunks.
      • Open Source: Benefits from a vibrant open-source community offering numerous modules to extend functionality.

    Node.js Modules

    • Modules:
      • Comparable to JavaScript libraries, providing sets of functions for use in applications.
    • Built-in Modules:
      • Node.js provides a collection of pre-installed modules.
      • Access modules using the require() function: var http = require('http');

    Creating and Including Your Own Modules

    • Creating Modules:
      • Create custom modules by defining properties and methods using the exports keyword.
      • Save the code in a .js file (e.g., myfirstmodule.js).
    • Including Modules:
      • Include your own module in other Node.js files using require() and a relative path: var dt = require('./myfirstmodule');

    Node.js HTTP Module

    • HTTP Module:
      • A built-in module for data transfer over the Hyper Text Transfer Protocol (HTTP).
      • Include via require('http').
    • Node.js as a Web Server:
      • The HTTP module creates an HTTP server to listen to ports and respond to client requests.
      • Use createServer() to establish the server.

    Creating a Web Server with Node.js

    • Basic Hello World Example:
      • Includes the http module and defines a server function that handles requests.
      • Sets the response status code, content type, and sends a 'Hello World' response.
      • Starts the server on a specified port and hostname.
    • Run the Example:
      • Save the code as server.js and run node server.js in the terminal.

    Node.js and Databases

    • Connecting to a Database:
      • Establish a connection to a database using modules like mysql.
      • Create a connection object with database credentials.
      • Connect to the database using the connect() method.
    • Querying a Database:
      • Use SQL statements to retrieve data from the database (querying).
      • The connection object provides a query() method to execute SQL statements.
      • Handle results and errors returned by the query.

    Creating and Managing Databases in Node.js

    • Creating a Database:
      • Use the CREATE DATABASE SQL statement to create a new database.
    • Creating a Table:
      • Use the CREATE TABLE SQL statement to create a table within a database.

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    ETT Notes - Unit 4 PDF

    Description

    This quiz covers essential tools and technical skills for back-end developers, focusing on programming languages like Python, PHP, and Java. You'll learn about popular frameworks, databases, and the importance of understanding data storage and retrieval. Test your knowledge on what it takes to be a skilled back-end developer.

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