URL Parameters and Query Strings

<p>fs.writeFile() (A)</p> Signup and view all the answers

<p>All of the above (D)</p> Signup and view all the answers

<p>Asynchronous and Non-blocking (C)</p> Signup and view all the answers

<p>Database Management (D)</p> Signup and view all the answers

<p>Node.js provides native system access (B)</p> Signup and view all the answers

<p>Interacts with the server to deliver user experience (A)</p> Signup and view all the answers

<p>Node.js environment (C)</p> Signup and view all the answers

<p>Synchronous programming (B)</p> Signup and view all the answers

<p>HTTP module (B)</p> Signup and view all the answers

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

<p>import http from 'http' (A)</p> Signup and view all the answers

<p>To create an HTTP server (A)</p> Signup and view all the answers

<p>To set the content type of the response (C)</p> Signup and view all the answers

<p>Async/await syntax (C)</p> Signup and view all the answers

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

<p>A set of functions you want to include in your application (A)</p> Signup and view all the answers

<p>To make properties and methods available outside the module file (C)</p> Signup and view all the answers

<p>fs.writeFile() (A)</p> Signup and view all the answers

<p>fs.unlink() (B)</p> Signup and view all the answers

<p>fs.rename() (B)</p> Signup and view all the answers

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

<p>npm install formidable (A)</p> Signup and view all the answers

<p>Throw a 404 error (A)</p> Signup and view all the answers

<p>It is executed concurrently and continues executing other tasks while waiting for the completion of asynchronous tasks in the background. (B)</p> Signup and view all the answers

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

<p>Callbacks can result in deeply nested and hard-to-read code. (A)</p> Signup and view all the answers

<p>To define the type of module system used in the code (D)</p> Signup and view all the answers

<p>Server-side programming (B)</p> Signup and view all the answers

<p>HTTP module (D)</p> Signup and view all the answers

<p>To define the dependencies and metadata of a Node.js project (B)</p> Signup and view all the answers

<p>ESM Import/Export (D)</p> Signup and view all the answers

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

<p>To set the status code and response headers (B)</p> Signup and view all the answers

<p>npm install formidable (D)</p> Signup and view all the answers

<p>Asynchronous and Non-blocking (B)</p> Signup and view all the answers

<p>To specify the dependencies of a Node.js project (C)</p> Signup and view all the answers

<p>Express.js (C)</p> Signup and view all the answers

<p>Real-time Applications (B)</p> Signup and view all the answers

<p>fs.appendFile() (D)</p> Signup and view all the answers

<p>To create a new HTTP server (B)</p> Signup and view all the answers

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

<p>A reusable block of code (B)</p> Signup and view all the answers

<p>All of the above (D)</p> Signup and view all the answers

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

<p>A JavaScript file that exports a set of functions or variables (C)</p> Signup and view all the answers

<p>To specify the dependencies of a Node.js project (C)</p> Signup and view all the answers

<p>const http = require('http'); (B)</p> Signup and view all the answers

<p>fs.readFile('demo.txt', 'utf-8', (err, data) =&gt; { ... }); (C)</p> Signup and view all the answers

<p>To make properties and methods available outside the module file (A)</p> Signup and view all the answers

<p>A set of functions you want to include in your application (D)</p> Signup and view all the answers

<p>fs.writeFile() (D)</p> Signup and view all the answers

<p>fs.unlink() (B)</p> Signup and view all the answers

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

<p>fs.writeFile() (C)</p> Signup and view all the answers

<p>To delete a specified file (B)</p> Signup and view all the answers

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

<p>http = Handling HTTP requests and responses fs = Working with the file system url = Parsing URL strings path = Working with file paths</p> Signup and view all the answers

<p>Web Applications = Creating dynamic web pages Real-time Applications = Building chat applications or gaming applications Streaming Applications = Handling large amounts of data in real time API Gateways = Managing and controlling access to multiple APIs</p> Signup and view all the answers

<p>Asynchronous and Non-blocking = Allows multiple requests to be handled simultaneously JavaScript Everywhere = Uses the same programming language on both client and server-side Scalability = Ability to handle a large number of requests without performance degradation Microservices Architecture = Building complex applications as a collection of small, independent services</p> Signup and view all the answers

<p>Fast and performant = Uses a JIT-based engine for greater server-side performance Large community and high popularity = Used by many developers and famous companies Single language in both client and server-side programming = Reduces the complexity of the development process Node.js files have extension '.js' = CommonJS or ES Module</p> Signup and view all the answers

<p>Client-side programming = All the code and data is executed and stored locally, mainly for user interface (UI) rendering Server-side programming = Code is executed on a web server, mainly focuses on delivering complete and interactive user experience Asynchronous code = Code that allows other code to run in the meantime, without waiting for it to finish Node.js File I/O = A module in Node.js that allows reading, creating, updating, and deleting files on a computer</p> Signup and view all the answers

<p>package.json = A file used for managing dependencies and scripts in a Node.js application Express.js = A framework that provides additional features and simplifies the development process in Node.js HTTP module = A module in Node.js that is commonly used for handling HTTP requests and responses Formidable module = A module in Node.js that is commonly used for handling file uploads</p> Signup and view all the answers

<p>Client-side programming = Code and data is executed and stored locally, mainly for user interface (UI) rendering Server-side programming = Code is executed on a web server, mainly focuses on delivering complete and interactive user experience Synchronous code = Code that is executed in a sequential manner, one statement at a time Asynchronous code = Code that allows other code to run in the meantime, without waiting for it to finish</p> Signup and view all the answers

<p>writeFile() = Replaces the specified file and content unlink() = Deletes the specified file rename() = Renames the specified file createServer() = Creates an HTTP server</p> Signup and view all the answers

<p>Replace the content of the file 'mynewfile3.txt' = writeFile() Delete 'mynewfile2.txt' = unlink() Rename 'mynewfile1.txt' to 'myrenamedfile.txt' = rename() Create an HTTP server = createServer()</p> Signup and view all the answers

<p>Formidable = A module for working with file uploads in Node.js npm install formidable = Command to download and install the Formidable module formidable = Node.js module for parsing form data, especially file uploads import formidable from 'formidable' = Code to include the Formidable module in an application</p> Signup and view all the answers

<p>Promises = Used to handle asynchronous operations in JavaScript Async/await = A newer syntax in JavaScript that simplifies asynchronous programming Modules = Considered to be the same as JavaScript libraries, a set of functions you want to include in your application try/catch block = Used to handle errors in JavaScript, i.e., rejected Promise</p> Signup and view all the answers

<p>Built-in Modules = Node.js has a set of these modules which can be used without any further installation Create Your Own Modules = You can create these and easily include them in your Node.js applications require() = A method used to import modules in Node.js using CommonJS module import syntax ESM Import syntax = A module import/export syntax used in Node.js that is part of ECMAScript 2015</p> Signup and view all the answers

<p>fs.readFile() = Used to read files on your computer in Node.js http.createServer() = Used to create an HTTP server in Node.js res.writeHead() = Used to write the HTTP header res.end() = Used to end the response process</p> Signup and view all the answers

<p>const http = require('http'); = Part of the CommonJS module import syntax import http from 'http'; = Uses ESM (ECMAScript 2015) module import/export syntax ./ = Used to locate a module in the same folder as the Node.js file export = A keyword used to make properties and methods available outside the module file</p> Signup and view all the answers

<p>fs.appendFile() = Appends specified content to a file. If the file does not exist, the file will be created. fs.open() = Opens a specified file for writing. If the file does not exist, an empty file is created. fs.writeFile() = Replaces the specified file and content if it exists. If the file does not exist, a new file, containing the specified content, will be created. fs.readFile() = Used to read files on your computer.</p> Signup and view all the answers

<p>req.url = The URL of the current request req.headers.host = The host of the current request myURL.search = The search params for the request URL searchParams.get('param1') = The value of 'param1' in the search params</p> Signup and view all the answers

<p>console.log(req.url); = Output: /.year=2017&amp;month=July console.log(<code>http://${req.headers.host}</code>); = Output: <a href="http://localhost:8080">http://localhost:8080</a> const txt = searchParams.get('year') + ' ' + searchParams.get('month'); res.end(txt); = Output: 2017 July console.log('Saved.'); = Output: Saved.</p> Signup and view all the answers

<p>fs.appendFile() = Creates a file if it does not exist fs.open() = Creates an empty file if it does not exist fs.writeFile() = Creates a new file with specified content if it does not exist fs.readFile() = Does not create a file</p> Signup and view all the answers

<p>Synchronous programming = Executed sequentially and waits for each task to be completed before moving on to the next one. Asynchronous programming = Executed concurrently and continues executing other tasks while waiting for the completion of asynchronous tasks in the background. Callback = In the past, due to the nature of asynchronous Javascript, many Javascript functions accept a callback argument that allows you to define code to be run after the task is completed (or failed). Promise = A new mechanism to handle asynchronous operations compared to traditional callbacks. Represents the eventual completion (or failure) of an asynchronous operation and its resulting value.</p> Signup and view all the answers

<p>ESM module = The newer module system for Node.js that enables ESM module support. package.json = A file that needs to be created in order to enable the ESM module support for Node.js. Node.js file initiation = The process that needs to be done before any action can take place on a file in Node.js. Callback hell = A term used to describe a situation where callbacks are nested within other callbacks, resulting in deeply nested and hard-to-read code.</p> Signup and view all the answers

<p>Synchronous programming = Predictable execution flow Asynchronous programming = Especially useful for waiting for I/O operation, i.e., remote call and File I/O Callback = Usually used when doing I/O, i.e., downloading files, doing File I/O, waiting for remote replies Promise = Allows defined callbacks to be run after the tasks are completed or settled in a chained way</p> Signup and view all the answers

<p>Promise = A mechanism to handle asynchronous operations in Node.js that represents the eventual completion (or failure) of an asynchronous operation and its resulting value. Callback hell = A term used to describe a situation in Node.js where callbacks are nested within other callbacks, resulting in deeply nested and hard-to-read code. package.json = A file in Node.js that needs to be created to enable the ESM module support. ESM module = The newer module system for Node.js that requires the creation of a 'package.json' file.</p> Signup and view all the answers

<p>HTTP module = $import$ http $from$ 'http' URL module = $import$ { URL } $from$ 'url' ESM Import = $import$ http $from$ 'http' CommonJS Import = $const$ http $=$ $require$('http')</p> Signup and view all the answers

<p>$createServer()$ = Creates an HTTP server that listens to server ports and gives a response back to the client $writeHead()$ = Sends a response header to the request $write()$ = Sends a response to the client $end()$ = Ends the response process</p> Signup and view all the answers

<p>$createServer()$ = $http.createServer((req, res) =&gt; { ... }).listen(8080);$ $writeHead()$ = $res.writeHead(200, {'Content-Type': 'text/html; charset=utf8'});$ $write()$ = $res.write('Hello World.');$ $end()$ = $res.end();$</p> Signup and view all the answers

<p>ESM Export = $export$ { MyDateTime } $from$ 'http' CommonJS Export = $exports.MyDateTime$ $=$ $function$ () { return Date(); }</p> Signup and view all the answers