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Test-Driven Development with Django ISBN 9781785281167 PDF

Test-Driven Development with Django ISBN 9781785281167 PDF

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Loading in 2 Seconds...ode.js Interview Questions and Answers book aims to save your time and make you more productive Node.js programmer. This book will provide a comprehensive guide for creating, debugging, testing and deploying production-ready Node.js applications. In this book each topic has been explained using appropriate questions with best appropriate answers and suitable examples. Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.Node.js Interview Questions and Answers All rights reserved. No part of this book can be reproduced or stored in any retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, uploading on server and scanning without the prior written permission of the author. The author of this book has endeavored to ensure the accuracy of the information described in this book. However, the author cannot guarantee the accuracy related to any interpretation the reader may assume from reading it. The author will not be liable for any damages, incidental or consequential caused directly or indirectly by this book or any of the information provided in it. Further, readers should be aware that the websites or reference links listed in this book may have changed or disappeared between when this book was written and when it is read. All other trademarks referred to in this book are the property of their respective owners. Release History Initial Release 1.0.0 - 8th Jul 2016 Second Release 1.0.1 - 12th Aug 2016 Page1 Dedication I dedicate this book to my mother Vriksha Devi and my wife Reshu Chauhan, who inspired me to write this Book. They deserve to have theirs name on the cover as much as I do for all IT professionals, theirs support made this possible. It is my deepest sincerity that I say to all my family members Virendra Singh(father), Jaishree and Jyoti(sisters), Saksham and Pranay(sons) and to my friends along with all of you who follow my blog www.dotnettricks.com without your continued encouragement and belief in me this book would not have been feasible. Shailendra Chauhan Page2 Introduction Writing a book has never been an easy task. It takes great effort, consistency with strong determination most importantly must have wisdom over the subject on which you are going to write. What Where Author Qualification to Write This Book Shailendra Chauhan is rewarded as MVP by Microsoft for his exceptional contribution in Microsoft Visual Studio and Development Technologies. With more than 7 years in hand experience over Microsoft technologies and collection of other technologies including JavaScript, MVC, AngularJS, Node.js, Ionic, MongoDB and NoSQL Databases to name but a few. His inspiration for authoring come from his enthusiasm for technology, ytic and initiative nature. Being a trainer, architect and blogger and passion for helping people inspire him for writing. Enormous feedback and support from his previous books which appreciated by all user inspire him to write Node.js interview questions and answers book. What This Book Is Node.js Interview Questions and Answers book aims to save your time and make you more productive Node.js programmer. This book will provide a comprehensive guide for creating, debugging, testing and deploying production-ready Node.js applications. In this book, each topic has been explained using appropriate questions with best appropriate answers and suitable examples. What You’ll Learn This book will help you to prepare yourself for interview on Node.js technology as well as it guides you to learn Node.js core modules and Node.js frameworks - Express, Koa, Socket.IO, and Node.js ORM/ODM - sequelize/Mongoose and Node.js testing frameworks - Mocha, Chai and JS task runners - Grunt, Gulp. Share to Help Others Hope you will enjoy this book and find it valuable for yourself. The author is truly delighted about this if you will share this book among others because he wants it to reach as many techy people as possible. Keep Connected with Us We always post about latest technologies updates on our website so that techy people keep themselves up to date. That’s why, we please to suggest you to subscribe yourself on www.dotnettricks.com. To get the latest release on Node.js, we encourage you to follow the official Node.js website at www.nodejs.org Our best wishes always with you for your interview and growth! Page3 About the Author ShailendraChauhan - An Entrepreneur, Author, Architect, Corporate Trainer, and Microsoft MVP With more than 7 years in hand experience, Shailendra Chauhan is a polymath in the domains of Microsoft .NET technologies and an array of other technologies including JavaScript, AngularJS, Node.js, Ionic and NoSQL Databases to name but a few. His extensive knowledge has been broadcast in a number of articles-of-the- day, and reported in daily-community-spotlight along with being listed in Recommended Resources for MVC section on the Official Microsoft ASP.NET Community Site. He has rewarded as Microsoft MVP for his exceptional contributions in Microsoft Visual Studio and DevelopmentTechnologies. Shailendra is the author of some of most popular e-books which encompass technical Interview on AngularJS Interview Questions and Answers, LINQ Interview Questions and Answers and MVC Interview Questions and Answers. Furthermore, he is a technical reviewer for book on ASP.NET MVC 4 Mobile App Development. Shailendra Chauhan is renowned for sharing his working experience, research and knowledge through his reputed and widely subscribed to blogs - www.gurukulsight.com and www.dotnettricks.com. Specifically, his blog www.dotnettricks.com provides a vast storehouse of knowledge and support resources in the field of .NET technologies worldwide and is listed as a non-Microsoft resource in The Microsoft Official Community Site. His blogs and training approach provide an easily accessible and highly innovative learning experience for people everywhere, and from a range of backgrounds and skill levels thereby offering the ultimate in training around the world. Moreover, and to his credit he has delivered 200+ trainingsessions to professionals world-wide in Microsoft .NET technologies and other technologies including JavaScript, AngularJS, Node.js, Ionic and NoSQL Databases. In addition, he provides Instructor-led online and classroom training programs for all above technologies. Shailendra’s strong combination of technical skills and solution development for complex application architecture with proven leadership and motivational skills have elevated him to a world-renowned status, placing him at the top of the list of most sought-after trainers. “I always keep up with new technologies and learning new skills to deliver the best to my students” says Shailendra Chauhan, he goes on to acknowledge that the betterment of his followers and enabling his students to realize their goals are his prime objective and a great source of motivation and satisfaction. Shailendra Chauhan - “Follow me and you too will have the key that opens the door to success” Page4 How to Contact Us Although the author of this book has tried to make this book as accurate as it possible but if there is something which strikes you as odd, or you find an error in the book please drop a line via e-mail. Our e-mail addresses are listed as follows: [email protected] [email protected] Follow Dot Net Tricks We sincerely hope you will enjoy reading this book and it will help you to get better understanding of the topic. You can also follow us on facebook, twitter, linkedin, google plus or subscribe to RSS feed. Thank you for reading!! Page5 Table of Contents Node.js Interview Questions and Answers ...................................................... 1 Dedication ....................................................................................................... 2 Introduction .................................................................................................... 3 About the Author ............................................................................................ 4 How to Contact Us .......................................................................................... 5 Node.js .......................................................................................................... 10 Q1. What is Node.js? ...................................................................................................................................... 10 Q2. Who has developed Node.js? .................................................................................................................. 10 Q3. What is io.js? ........................................................................................................................................... 10 Q4. What is Node.js foundation? ................................................................................................................... 11 Q5. What is NPM? .......................................................................................................................................... 11 Q6. What is V8 JavaScript Engine? ................................................................................................................. 11 Q7. Why to use JavaScript on Server Side? .................................................................................................... 12 Q8. What IDEs you can use for Node.js development? ................................................................................. 12 Q9. How Node.js is different from others Server Side Frameworks like ASP.NET, Php, JSP and Ruby etc.? . 12 Q10. Where you can deploy Node application? .............................................................................................. 13 Q11. Which types of application can be developed using Node.js? ................................................................ 14 Q12. Who are using Node.js for their development? ...................................................................................... 14 Q13. What platforms Node.js supports? ......................................................................................................... 14 Q14. What are the advantages of Node.js? ..................................................................................................... 14 Q15. What are the limitations of Node.js? ...................................................................................................... 15 Q16. Where you can deploy Node.js web application? ................................................................................... 15 Q17. Explain Blocking and non-blocking operations? ...................................................................................... 16 Q18. Explain Node.js Event Loop? ................................................................................................................... 16 Q19. What is callback? ..................................................................................................................................... 17 Q20. What is Callback Hell and how to avoid it? ............................................................................................. 18 Page6 Q21. Explain Node.js Architecture? ................................................................................................................. 18 Q22. What is Module? ..................................................................................................................................... 19 Q23. What are core modules in Node.js? ........................................................................................................ 20 Q24. What is REPL Terminal? ........................................................................................................................... 21 Q25. What are the useful commands of REPL Terminal? ................................................................................ 21 Q26. What are the useful shortcuts of REPL Terminal? ................................................................................... 21 Q27. What are Node packages and how to install/uninstall them? ................................................................ 21 Q28. What are the various options to download the version of a node module? .......................................... 23 Q29. What is package.json file in node project?.............................................................................................. 24 Q30. What is the difference between Package dependencies and development dependencies? ................. 25 Q31. What is the difference between module.exports and exports in Node.js? ............................................ 26 Q32. How to share a variable between Node.js modules? .............................................................................. 26 Q33. What are global variables in Node.js? ..................................................................................................... 27 Q34. What are buffers? .................................................................................................................................... 27 Q35. How to create buffers? ............................................................................................................................ 27 Q36. How to decode buffers? .......................................................................................................................... 28 Q37. What are Streams? .................................................................................................................................. 28 Q38. What are the different types of Streams? ............................................................................................... 29 Q39. What are Events and Event Emitters? ..................................................................................................... 29 Q40. What events are supported by readable streams? ................................................................................. 29 Q41. Give an example of readable stream with non-flowing mode? .............................................................. 29 Q42. Give an example of readable stream with flowing mode? ..................................................................... 30 Q43. What events are supported by writable streams? .................................................................................. 31 Q44. Give an example of writable stream? ...................................................................................................... 31 Q45. What is Streams piping? .......................................................................................................................... 31 Q46. How to debug the code in Node.js? ........................................................................................................ 32 Q47. How to debug the code using Node.js Built-In debugger? ...................................................................... 32 Q48. How to debug the Node.js code using Node Inspector? ......................................................................... 32 Q49. How to debug the Node.js code using IDE debuggers? .......................................................................... 33 Q50. How to handle errors in Node.js? ............................................................................................................ 34 Q51. What are uses of path module in Node.js? ............................................................................................. 36 Q52. What functions are provided by path module in Node.js? ..................................................................... 36 Page7 Q53. What is File System module in Node.js? ................................................................................................. 36 Q54. What functions are provided by fs module to perform I/O operations on a file? .................................. 36 Q55. What functions are provided by fs module to perform I/O operations on a directory? ........................ 40 Q56. How to check a file/directory existence in node.js? ............................................................................... 41 Q57. Which types of network application you can build using node.js? ......................................................... 41 Q58. How to create TCP Server and TCP Client? .............................................................................................. 41 Q59. What is socket?........................................................................................................................................ 42 Q60. What are WebSockets? ........................................................................................................................... 43 Q61. How to create an Http Server using Node.js? ......................................................................................... 43 Q62. What are Node.js Http module limitations? ........................................................................................... 43 Q63. What is SSL/TLS? ...................................................................................................................................... 43 Q64. How to create an Https Server using Node.js? ........................................................................................ 43 Q65. How to create a self-signed certificate in Node.js? ................................................................................. 45 Q66. What is socket.io? ................................................................................................................................... 45 Q67. How to create a simple chat app using socket.io? .................................................................................. 45 Q68. What is middleware? ............................................................................................................................... 47 Q69. What is connect? ..................................................................................................................................... 48 Q70. What are various node.js web development frameworks? .................................................................... 48 Q71. What are various node.js REST API frameworks? ................................................................................... 49 Q72. What is Express? ...................................................................................................................................... 49 Q73. Why to use Express? ................................................................................................................................ 49 Q74. How to create an Http server using Express?.......................................................................................... 50 Q75. How to define routes using Express? ...................................................................................................... 50 Q76. What is the use of Express Router Class? ................................................................................................ 51 Q77. What is template engine? ....................................................................................................................... 51 Q78. What template engines you can use with express? ................................................................................ 51 Q79. What are the advantages of template engines? ..................................................................................... 51 Q80. What is Koa? ............................................................................................................................................ 52 Q81. How to create an Http server using Koa? ................................................................................................ 52 Q82. What is Unit Testing? .............................................................................................................................. 52 Q83. Why to do Unit Testing? .......................................................................................................................... 53 Q84. What are node.js unit testing frameworks? ............................................................................................ 53 Page8 Q85. What is Test Driven Development (TDD)? ............................................................................................... 53 Q86. What is Behavior Driven Development (BDD)? ....................................................................................... 54 Q87. What is Acceptance Test Driven Development (ATDD)? ......................................................................... 54 Q88. What is Jasmine? ..................................................................................................................................... 55 Q89. What is Mocha? ....................................................................................................................................... 55 Q90. What are the most popular Node.js ORM? ............................................................................................. 55 Q91. What are JavaScript task runners? .......................................................................................................... 55 Q92. What are Grunt and Gulp? ...................................................................................................................... 56 Q93. What is the difference between Grunt and Gulp? .................................................................................. 57 Q94. How Grunt and Gulp deal with Task Automation? .................................................................................. 57 Q95. What is MEAN stack? ............................................................................................................................... 58 Q96. Why to use MEAN stack? ........................................................................................................................ 58 Q97. What is MongoDB? .................................................................................................................................. 59 Q98. Why to use MongoDB? ............................................................................................................................ 59 Q99. What is AngularJS? .................................................................................................................................. 59 Q100. What is the recommended folder structure for MEAN app development? ....................................... 60 Other Free E-Books ....................................................................................... 61 Page9 Node.js ......................................................................... 54 Q1. Ans. etc. It is an open-source and cross-platform framework based on Google's V8 JavaScript Engine. What is Node.js? Node.js is a server side JavaScript environment for developing web applications like as ASP.NET, JSP, Php It is used to build fast and scalable network applications as well as data-intensive real-time web applications. All versions of Node.js are starting from 0.1.0 releases to 0.1.x, 0.2.x, 0.3.x, 0.4.x, 0.5.x, 0.6.x, 0.7.x, 0.8.x, 0.9.x, 0.10.x, 0.11.x, and 0.12.x. Before merging of Node.js and io.js, it’s last versions was Node.js v0.12.9. What Node.js is not? Node.js is not a JavaScript library, but it is a platform to execute JavaScript on server side. Node.js programs are written in JavaScript but there is no DOM manipulation provided by Node.js. Q2. Ans. supporting only Linux. In 2011, windows version was released. Who has developed Node.js? Node.js was developed by Ryan Dahl and other developers working at Joyent. It was first released in 2009 Q3. Ans. development and predicted releases of code under an "open governance model". Since, Node.js was governed by Joyent Inc. What is io.js? io.js is a fork of the Node.js project which was created in December 2014. It was created to accelerate the Page10 All versions of io.js are starting from 1.0 releases to 1.x, 2.x and 3.x. Before merging of Node.js and io.js, it’s last versions was io.js v3.3.1. Note: In Sep 14, 2015, Node.js and io.js are merged into a single code base known as Node.js version 4.0. In this way, the much-awaited Node.js version 1.0 never happened. Q4. Ans. Node.js. It has developers from IBM, Microsoft, PayPal, Joyent, Fidelity, SAP and other companies. What is Node.js foundation? The Node.js foundation is an independent foundation to take care of development and releases of In Sep 14, 2015, the Node.js foundation announced the combined release of Node.js and io.js into a single code base known as Node.js version 4.0. It has a features of Node.js and io.js including a lot of new features of ES6. Q5. Ans. 2011 to share and update open-source libraries like jQuery, AngularJS, React etc. What is NPM? NPM stands for Node Package Manager. It's an online repository of node packages. It was released in Q6. Ans. written in C++ language and implements ES5. What is V8 JavaScript Engine? V8 is an open source JavaScript engine developed by Google in 2008 to be used in Chrome browser. It is Key Points about V8 JavaScript Engine It can be run standalone or can be embedded into any C++ application. It uses just-in-time compilation (JIT) to execute JavaScript code. It compiles JavaScript to native machine code (IA-32, x86-64, ARM, or MIPS ISAs) before execution. It is used by many open source projects like Node.js and MongoDB to execute JavaScript on server side. Page11 Q7. 2.x and 3. Ans. Why to use JavaScript on Server Side? There are following reasons to use JavaScript on Server Side: Unified language for both front-end and back-end. Increase programmer productivity. Code reusability. Exchange of data using JSON. JavaScript with V8 engine performs faster than Php, Ruby, Python, JSP and ASP.NET. Q8. Ans. What IDEs you can use for Node.js development? AngularJS development can be done with the help of following IDEs: 1.Visual Studio 2013, 2015 or higher 2.Visual Studio Code 3.Atom 4.Node Eclipse 5.WebStorm 6.Sublime Text Q9. How Node.js is different from others Server Side Frameworks like ASP.NET, Php, JSP and Ruby etc.? Today, Node.js is the most popular and widely used server side framework for small, large and any sized web app and web application development. Ans. Node.js is different from existing server-side frameworks because it is based on asynchronous events via JavaScript callback functionality and uses the JavaScript as a programming language. Moreover, everything inside Node.js runs in single thread. Page12 While existing server-side framework like ASP.NET, JSP and Php etc. are based on multiple threads web server (IIS/Tomcat). In multiple threads system, there is a limit of maximum number of threads, beyond which the throughput decreases. There are following issues with Multi-threaded systems: 2.x and 3. Under heavy load a multi-threaded web server consumes a large amount of memory. Most of the time threads wait till some I/O operations finish. Context-switching and scheduling increases drastically with large number of threads. Q10. Ans. dedicated servers to install node and run your application. Where you can deploy Node application? Node.js app cannot be deployed on your existing hosts like shared web hosting etc. You can use VPS or The easiest way to deploy your node application is to use a scalable service like Heroku, which is completely free and you only need to pay when you are using more resources. 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