#node js interview question pdf

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Top 20 jQuery Interview Questions and Answers for Experienced(Download Free PDF)

1. What's jQuery? Ans: JQuery isn't a programming language but a nicely composed JavaScript code. 2. Why jQuery is necessary? Ans: JQuery is necessary for the next listing: Employed to create browser compatible web applicationsEnhance the Operation of a programExtremely Fast and adaptiveUI associated functions are composed in minimal traces of codes. 3.Whether jQuery HTML work for both HTML and XML documents?Ans: No, jQuery HTML only works for HTML documents not for XML Documents. 4. Which are the approaches used to supply effects? Ans: A Few of the effects approaches are: 5. What's the benefit of utilizing a minimized variant of jQuery? Ans: Performance of web page raises when minimized variant of jQuery is used.min.js document will probably be more than 50 per cent less compared to standard js file. Decline in the file dimensions leaves the webpage quicker. 6. Is jQuery is a JavaScript or JSON library file? Ans: JQuery is reportedly one JavaScript file. 7. Which operating system is much more harmonious with jQuery? Ans: Mac, Windows and Linux are more compatible with the jQuery. 8. How do we include jQuery library at ASP.Net project? Ans: Download the jQuery library out of jQuery.com and add that mention from the asp.net page. 9. Which command provides a variant of jQuery? Ans: The control $.ui. Variant returns jQuery UI variant. 10. In what situations jQuery may be utilized? Ans: JQuery may be utilized in the following situations: 11. What's the difference between locating and kids approaches? Ans: Find method is used to locate all degrees down the DOM tree, but kids find single degree down the DOM tree. 12. What's jQuery connect? Ans: A' jQuery link' is a plugin used to join or bind a function with a different function. Link is used to do purpose from any other purpose or plugin is implemented. 13. The way to use the link? Ans: Connect can be utilized by downloading jQuery link file from jQuery.com and include that file from the HTML file. Utilize $.connect work to link a function to another function. 14. What are the characteristics of jQuery, has been utilized in web applications? Ans: jQuery uses features like Sliding, File uploading and accordian in web applications. 15. What will be the browser associated problems for jQuery? Ans: Browser compatibility of jQuery plugin is a problem and requires a great deal of time to repair it. 16. Whether we must add jQuery document in the Master and Content webpage? Ans: JQuery document ought to be added to the Master page and may use access from the articles page right without needing any reference to it. 17. Which are the fundamental selectors in jQuery? Ans: Following are the fundamental selectors in jQuery: 18. Can we predict C# code behind utilizing jQuery? Ans: Yes, we could predict C# code out of jQuery since it supports. Net program. 19. What's the usage jQuery. Data technique? Ans: JQuery.data methods can be used to connect the information with the DOM nodes along with the objects. This information system creates the jQuery code concise and clear. 20. What's the use of every operate in jQuery? Ans: Each function can be used to iterate each element of an item. It's used to loop DOM components, arrays along with the item properties. Know more

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Node.js Skills Assessment Online Test

Node.js is commonly used by developers who prefer to use Javascript for the sake of server-side scripting and building web applications. It is also known as a cross-platform / open source platform that uses a back-end JavaScript runtime environment.

Quizack is better for fast learning Node.JS

The Quizack platform is not in the habit of providing typical Node JS tutorials with outdated information. In fact, we have experts behind our Node JS assessment questions, who have created our content based on recent skills.

The Quizack Node.JS quiz engine contains questions on node modules, NPM, node CLI, development tools and frameworks, and Node JS coding questions.

Learn effectively through interactive exercises

We do not offer a Node JS online quiz in typical Doc or PDF format. But we are making you exercise those questions through our interactive "Node.JS Q&A" mode. This practice mode has made Node.JS coding exercises much easier. Users are free to explore the questions and see their correct answers.

If you are looking to put your skills to the test, then our virtual Node.JS Online Test is here for this particular purpose. Through this virtual test, you will face randomly selected questions and you will have to answer them in a predefined time. For the sake of your self-assessment, the correct answers will be displayed last.

Who can join Quizack?

If you want to become a Node.JS developer

Looking to become a front-end developer

need to know the difficult PEM answers

will appear on the IT line or independent skill test

trying to find the latest interview questions for the relevant position

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300+ TOP LESS Interview Questions and Answers

Less Interview Questions for freshers experienced :-

1. What is Less? Less is a dynamic style sheet language that can be compiled in to CSS (Cascading style Sheet). It runs on client side and server side. It is designed by Alexis Sellier in 2009. 2. In which language Less was implemented? Less was implemented into JavaScript Language. 3. What are the features of Less? There are following features of Less: It is easy to readable code and written in organized way. We can define style and it is reusable. It is based on JavaScript and CSS. It sorts the code redundancy. 4. What are the ways to used Less? There are three ways to used Less: Via NPM (Node Package Manager) Download script file for the browse. It can used for third party tools. 5. What are the color channel functions in Less? The color channel functions in Less are: hue saturation hsvhue saturation hswalue red green etc. 6. What are the similarities between Less and Sass? The similarities between Less and Sass are: Nesting capabilities Namespaces Color functions Mixins and parametric mixins JavaScript evaluations 7. What is Mixins in Less? In Less, Mixins enable embedding all the properties of a class into another class. It includes the class name as one of its properties. It is just like a variable. 8. What is the difference between Less and Sass? The difference between Less and Sass are: Less                                                                                              Sass It uses JavaScript and client-side.                        1. It uses ruby and processed at server-side. It is processed at client side.                                  2. It is processed at server side. It uses @symbol to declare variable.                    3. It uses $ symbol to declare variable. It doesn’t inherit multiple selectors.                    4. It inherits multiple selectors. It doesn’t work with unknown units.                   5. It allows us to work with unknown units. 9. What is the data URI in LESS? In Less, data URI allows developer to avoid external image and reduce HTTP request. 10. What is Source Map Less Inline? Map Less Inline helps to include all the CSS files into the sourcemap. 11. What are the operations used in Less? There are various operations used in Less: Arithmetic operators( +, – , *, / ) Color functions Math functions etc. 12. How can we declare the Less variables? We can declare the Less variables by using (@) and (:) symbols. 13. What is the use of e() function in Less? In Less, e() function is used to escape a value. It passes straight through the compiled CSS without being noticed by the Less compiler. 14. How can we invoke the compiler in Less? In Less, we can invoke the compiler by using command line: $ lessc styles.less $ lessc styles.less > styles.css 15. What is the use of &combinatory in Less? In Less, &combinatory is used to concatenates nested selector with parent selector. It is useful for Pseudo classes. Example : hover and focus 16. Who is the developer of LESS? Alexis Sellier and Dmitry Fadeyev is the developer of LESS. 17. Why should we use LESS? We should use LESS because of its features: It is faster and easy to use. It is design in JavaScript. It keeps our code in modular way. 18. In which language the first version of LESS was written? The first version of LESS was written in Ruby. 19. Which command is used to compile the style.less file to style.css? The given code is used to compile the style.less file to style.css. lessc style.less style.css 20. What are the ways to comment the code in LESS? In LESS, there are two ways to comment the code. //Single line comment.*/ /*multi line comment 21. Which directive is used to import the files in the code? @import directive is used to import the files in the code. 22. What are the types of Misc function in LESS? There are various types of Misc function in LESS: color image-size default get-unit svg-gradient etc. 23. What are the type functions in LESS? In LESS, there are various type functions: isnumber isstring iscolor iskeyword isurl etc. 24. How can we disable the JavaScript in LESS? W can disable the JavaScript in LESS by using following code: lessc –no-js 25. What is rootpath in LESS? In LESS, rootpath is used to set the paths of URL. 26. What are the UI/Theme frameworks supported by LESS? There are various UI/Theme framework supported by LESS 1pxdeep Bootflat BootPress BootPress Boot 27. What are the types of Node.js compilers used in LESS? In less, there are various Node.js compilers used that are given below: grunt-contrib-less assemble-less gulp-less autoless etc. 28. What are the different types of operators in LESS? In LESS, the different types of operators are given below: Number Operations Color Operations String Operations Boolean Operations List Operations 29. What are the types of operations used in LESS? There are various type of operations used in LESS. Simple Mathematical operators: +, ? , *, / Color functions Math functions etc. 30. How many ways to use LESS? There are following ways to use LESS: Less can be used in three ways: Via npm LESS can be used on the command line. Download as a script file for the browser. It can be used for third party tools. Less Questions and Answers Pdf Download Read the full article

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#341: TC39, ECMAScript, and the Future of JavaScript

This week's JavaScript news — Read this e-mail on the Web

JavaScript Weekly

Issue 341 — June 30, 2017

TC39, ECMAScript, and the Future of JavaScript

A thorough explanation of how new features make it into JavaScript, before focusing on some practical examples including Array#includes, named captures, and lookbehind assertions in regexes.

Nicolás Bevacqua

Automated Testing with Headless Chrome

Eric Bidelman runs through how to use Headless Chrome, using Karma as a runner and Mocha+Chai for authoring tests.

Google Developers

Optimizing AWS Lambda performance with MongoDB Atlas and Node.js

See the performance implications of using Lambda functions with a database-as-a-service like MongoDB Atlas.

MONGODB   Sponsor

ECMAScript 2017 Language Spec Published

The official spec for ES2017 (essentially the 8th edition of the JS spec) has been published in HTML and PDF if you’re lacking for bedtime reading.

ECMA

React Armory: A Neat Way to Learn React Online

A well presented tutorial site complete with rich, live editable examples.

James K Nelson

Vulcan: An Open-Source Project to 'Meteorize' GraphQL

A full-stack app framework built on React and GraphQL. It’s an evolution of Telescope but is becoming less Meteor-dependent.

Sacha Greif

TypeScript 2.4 Released

Includes support for cynamic import() expressions, string enums, improved checking and more.

Microsoft

This Week's React-Specific News

React Status is our React focused weekly. This week it includes a React Native starter kit and an introduction to Redux-first routing.

React Status

Jobs

JavaScript Developer at X-Team (Remote)We seek a developer with extensive JavaScript knowledge. We're 100% remote and provide the funding needed to help you achieve your goals and grow. X-Team

Front End Engineer at EDITED (London)Join us to impact how the world's biggest retailers operate by making a web app with great UX and DX using React, Redux and Glamor. EDITED

Can't find the right job? Want companies to apply to you? Try Hired.com.

In Brief

Babylon, Babel's JS Parser, To Support TypeScript news Not a lot to see yet, but .ts support has been baked in. Babel

Microsoft's 'Sonar' Linting Tool Joins the JS Foundation news Check out Sonar’s homepage to learn more. Kris Borchers

Use AngularJS to Build a Fast and Secure Chat App  PubNub gets your data anywhere in less than 0.25 seconds. It’s so easy with PubNub’s AngularJS library. PubNub  Sponsor

The 'Best' Frontend JavaScript Interview Questions tutorial Opinions will vary but if you do well at these, you’re in a strong position. Boris Cherny

Getting Started with Webpack 3 tutorial João Augusto

Build A Realtime Chart with Vue.js and Pusher tutorial Yomi Eluwande

Unleash The Power of Angular Reactive Forms video Oriented around live coding a form from scratch. Nir Kaufman

Choosing A Frontend Framework in 2017 opinion This Dot Labs

Why I'm Switching from React to Cycle.js opinion SitePoint

Using Source Maps to Debug Errors  Let's talk JavaScript Source Maps. What are they? How to enable source mapping? Why aren't they working? ROLLBAR  Sponsor

Decaffeinate: Convert Your CoffeeScript to Modern JavaScript tools A well established project that continues to get frequent updates. Brian Donovan

An Up to Date List of TC39 Proposals and their Status tools Nicolás Bevacqua

Search and Install npm Modules Automatically from the Atom Editor tools Algolia

Infinite Scroll v3: As Users Scroll, Automatically Load More tools Note it’s both GPL3 and commercial. Metafizzy

Study: A Progressive, Client/Server AB Testing Library code Dollar Shave Club

echarts: Powerful Charting and Visualization in the Browser code Lots of demos here. Baidu

vanilla-tilt.js: A Dependency-Free, Smooth 3D Element Tilting Library code

RE:DOM: A Tiny (2KB) JS Library for Creating User Interfaces code Juha Lindstedt

frontexpress: An Express.js-Style JavaScript Router for the Front-End code Camel Aissani

share-this: Medium-like Text Selection Sharing Without Dependencies code Massimo Artizzu

ForwardJS Tickets on sale today  ForwardJS  Sponsor

Curated by Peter Cooper and published by Cooperpress.

Like this? You may also enjoy: FrontEnd Focus : Node Weekly : React Status

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300+ TOP Express JS Interview Questions and Answers

Express JS Interview Questions for freshers experienced :-

1. What is ExpressJs? Express Js is a framework for node.js which is light-weight and fast. It is used to develop web and mobile applications. 2. What are the features of ExpressJs? Following are the features of Expressjs: It allows middleware set up to respond HTTP Requests It defines routing table which is used to achieve action based on HTTP Method and URL. It allows dynamically generate the HTML Pages based on passing arguments to the templates. It follows MVC architecture for web application. 3. What is middleware in ExpressJs? Middleware is a function that accesses the request object (req), response object (res), and access next middleware function in application’s request-response cycle. The next middleware function is represented by variable called ‘next’. Syntax: function(req,res,next){ } 4. Can middleware is able for error handling? Explain error handling in ExpressJs. Middleware is able to handle error handling in ExpressJs. This can be done by passing one extra error-handling (err) parameter in middleware function. Syntax: function(err,req,res,next){ } 5. What is ‘next’ in ExpressJs? ‘next’ is a parameter which is passed in middleware function to pass control to next middleware. function(req,res,next){ } 6. What is routing? Routing define how an application responds over client request to a particular endpoint (URI). Endpoint is specially a path and any one of HTTP request methods (GET, POST, etc). Following structure is used for routing: app.METHOD(PATH,HANDLER) Note: METHOD is Http request method (in lowercase), PATH is uri on server, HANDLER is function name. 7. How to configure properties in ExpressJs application? We can configure properties in two ways: With Process.env. Create a file with extension ‘.env’ inside the project folder. Add all the properties in ‘.env’ file. In server.js any of properties can use: var host=process.env.APP_HOST; app.set('host',host); logger.info(app.get('host'); With RequireJs. Create a file 'config.json' inside 'config' folder of the project folder. Add config properties in 'config.json' file. Use require keyword to access the 'config.json' file. var config =require('./config/config.json'); 8. How debugging are done in ExpressJs? Different operating system uses different commands: Windows: set DEBUG = express:* & node index.js Linux: $ DEBUG = express:* & node index.js 9. Define templating in ExpressJs? Templating are powerful engine used for removing the cluttering of our server code with HTML. Some of the templates which are with ExpressJs are: Pug Mustache EJS 10. What is cookie and what it does? Cookie is a data sent from server and stores on the client side. It keeps the information of user’s actions. These are some following purpose of using cookie: Session management User tracking Personalization 11. How to use cookies in ExpressJs? Cookies are used in ExpressJs by installing ‘cookie-parser’ middleware. To install cookie-parser we use command as: npm install --save cookie-parser To set new cookie in our application, we define a new route. app.get('/',function(req, res){ res.cookie('name','express').send('cookie set') }); 12. How to delete cookie in ExpressJs? The clearCookie method is used to delete cookies in ExpressJs. clearCookie('cookie_name'); app.get('/clear_cookie_temp',function(req,res)){ clearCookie('temp'); res.send('cookie temp is cleared'); }); 13. How to handle 404 errors or redirect error to another page? We use the following code in server.js file to redirect 404 errors to another page in ExpressJs. app.use(function(req, res, next){ res.status(404).json({errorCode: 404, errorMessage: requested resources not found”}); }); 14. What is scaffolding? Scaffolding is a tool, which set up all required public directory, add middleware, create separate route file etc (set up skeleton for web application). So that we can directly get started building our application. Yeoman is scaffolding tool built for Node.js. 15. How to get the full url In ExpressJs? var port = req.app.settings.port || cfg.port; res.locals.requested_url = req.protocol + '://' + req.host + ( port == 80 || port == 443 ? '' : ':'+port ) + req.path; 16. How do i render plain html? There’s no need to “render” HTML with the res.render() function. If you have a specific file, use the res.sendFile() function. If you are serving many assets from a directory, use the express.static() middleware function. 17. How to implement jwt authentication in express app ? Explain with example? Create a folder called ‘keys’ inside project folder. Install some dependencies as following: Npm install jsonwebtoken –save Add the login router routes/index.js router.post('/login, function(req, res) { // find the user User.findOne({ name: req.body.username }, function(err, res) { if (err) throw err; if (!res) { res.json({ success: false, message: Login failed.' }); } else if (res) { // check if password matches if (res.password != req.body.password) { res.json({ success: false, message: Login failed. Wrong password.' }); } else { var token = jwt.sign(res, app.get('superSecret'), { expiresInMinutes: 1600 }); // return the information including token as JSON res.json({ success: true, message: 'Valid token!', token: token }); } } }); }); Use the token in application jwt = require("express-jwt"); app.use(function(req, res, next) { var token = req.body.token || req.query.token || req.headers; if (token) { jwt.verify(token, app.get('superSecret'), function(err, decoded) { if (err) { return res.json({ success: false, message: 'Invalid token.' }); } else { req.decoded = decoded; next(); } }); } else { return res.status(403).send({ success: false, message: 'No token given.' }); } }); Express JS Questions and Answers Pdf Download Read the full article