[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-391753-105":3,"doc-detail-391753-en":81,"detail-sidebar-cat-0-en-105":98},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","javascript-technical-interview-questions-sample","Javascript Technical Interview Questions - Sample","","A Leanpub sample ebook focused on preparing for JavaScript technical job interviews. It introduces the author’s motivation, explains common JavaScript pitfalls, and uses short, interview-style questions with reasoning and examples. The sample includes sections such as IIFE behavior, the comma operator, object coercion, and interview conversation guidance, aiming to “debunk” confusing language quirks and build mastery for smoother interviews.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/exam/","Exam",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/javascript-technical-interview-questions-sample/391753/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/javascript-technical-interview-questions-sample/391753.png","ImageObject",300,407,{"name":42,"@type":43},"Aria","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-09","2026-09-25",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",8,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What is the purpose of this book sample?","Question",{"text":63,"@type":64},"It aims to help candidates prepare for JavaScript job interviews by debunking confusing language behavior and turning quirks into understandable concepts.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"Why are IIFEs (Immediately Invoked Function Expressions) used?",{"text":68,"@type":64},"They allow a function to be defined and immediately executed, while also helping reduce scope lookups and prevent pollution of the global namespace.",{"name":70,"@type":61,"acceptedAnswer":71},"In the IIFE examples, why does Example 2 return 5?",{"text":72,"@type":64},"Because the code is parsed as a FunctionDeclaration rather than a FunctionExpression, following ECMAScript’s parsing rules.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},391753,1790437090,{"code":4,"msg":82,"data":83},"success",{"doc_id":79,"user_id":84,"nickname":42,"user_avatar":85,"doc_module":4,"category_id":33,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":86,"file_id":87,"file_url":88,"file_type":89,"file_size":90,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":91,"language":92,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":93,"faqs":94,"seo_title":95,"seo_description":12,"update_tm":96,"read_time":97,"preview_page_count":4},2336464648322,"https://ap-avatar.wpscdn.com/avatar/2200025388227c56fec?_k=1778556882303663488","Javascript Technical Interview Questions  \nPrepare Yourself For That Dream Job Xuanyi Chew  \nThis book is for sale at [http://leanpub.com/jsinterviewquestions](http://leanpub.com/jsinterviewquestions)[ ](http://leanpub.com/jsinterviewquestions)[This version was published on 2014-03-19](This version was published on 2014-03-19)  \nThis is a Leanpub book. Leanpub empowers authors and publishers with the Lean Publishing process. Lean Publishing is the act of publishing an in-progress ebook using lightweight tools and many iterations to get reader feedback, pivot until you have the right book and build traction once you do.  \n©2014 Xuanyi Chew  \nContents  \nSample of Underhanded JavaScript ............................. 1  \nIntroduction .......................................... 2  \nOn IIFE Behaviour ...................................... 3  \nThe Explanation ....................................... 4  \nExceptions .......................................... 5  \nDuring The Interview .................................... 6  \nOn The Comma Operator ................................... 7  \nThe Explanation ....................................... 7  \nMiscelleny .......................................... 9  \nPractice Questions ...................................... 10  \nDuring The Interview .................................... 11  \nOn Object Coercion ...................................... 12  \nThe Explanation ....................................... 13  \nPractice Questions ...................................... 15  \nDuring The Interview .................................... 16  \nSample of Underhanded JavaScript  \nHi there!  \nThis is the sample of Underhanded JavaScript: How to Be A Complete Arsehole With Bad JavaScript. Included are three chapters (there are 12 more in the proper book when published) . I hope you have fun reading it, and eventually, do buy it.  \nIntroduction  \nThe motivation for me to write this book was originally boredom. I was joking with my colleagues at my startup that JavaScript has so many pitfalls that I could write a book on it. I was then egged on to actually write it, and so I started drafting a series of blog posts when Hacker News went down and I had no other entertainment. Eventually, it became obvious that a collection of JavaScript quirks would be better suited in a book format than a blog post.  \nAt the same time, Iwas doing a few friends a favour by helping them outwith interviewing a few candidates for a JavaScript position. I found that the candidates were not able to answer questions derived from the first three chapters of the book. To be fair, I did ask rather obscure questions about JavaScript and I didn’t expect the candidates to do well, for even the most experienced of JavaScript developers fall for some of these. For example:  \nDo you know why \"true\" == true will return false? What really happens behind the scenes when variables are “hoisted”? Why do numbers in JavaScript act so strangely?  \nThis book aims to help potential candidates on their job interview. I do so by debunk the strangeness, and make it not strange. JavaScript doesn’t have quirks once you understand the language. And it is only with mastery of the language will a technical interview go over smoothly. In the book, I also suggest ways to further a conversation in an interview.  \nI had fun writing this book. And I sincerely hope that it will, to some extent help you in getting that dream job of yours.  \nOn IIFE Behaviour  \nImmediately Invoked Functions, in particular Immediately Invoked Function Expressions¹ are a commonly used Javascript design pattern. An IIFE is basically where a function is defined, and then immediately called. It is quite useful in compressing code and reducing scope lookups for more effective execution of code.  \nMany people also use IIFEs to prevent pollution of the global namespace. If function foo() is ever going to be called once, and it isn’t ever going to be referenced again, why add foo to the global object? A","cbCaiuwnVtkUJkdu","https://ap.wps.com/l/cbCaiuwnVtkUJkdu","pdf",1194435,19,"English","# Sample of Underhanded JavaScript\n## Introduction\n## On IIFE Behaviour\n## The Explanation\n## Practice Questions\n## On Object Coercion\n## Miscelleny","[{\"question\":\"What is the purpose of this book sample?\",\"answer\":\"It aims to help candidates prepare for JavaScript job interviews by debunking confusing language behavior and turning quirks into understandable concepts.\"},{\"question\":\"Why are IIFEs (Immediately Invoked Function Expressions) used?\",\"answer\":\"They allow a function to be defined and immediately executed, while also helping reduce scope lookups and prevent pollution of the global namespace.\"},{\"question\":\"In the IIFE examples, why does Example 2 return 5?\",\"answer\":\"Because the code is parsed as a FunctionDeclaration rather than a FunctionExpression, following ECMAScript’s parsing rules.\"}]","Javascript Technical Interview Questions - Sample | PDF",1790358491,48,{"code":4,"msg":82,"data":99},[100,104,108,111,116,121,126,130,135,138,142],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":101,"show_sort_weight":102,"slug":103},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":105,"show_sort_weight":106,"slug":107},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":109,"slug":110},70,"exam",{"id":112,"doc_module":4,"doc_module_name":25,"category_name":113,"show_sort_weight":114,"slug":115},5,"Comic",60,"comic",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":118,"show_sort_weight":119,"slug":120},6,"Technology",50,"technology",{"id":122,"doc_module":4,"doc_module_name":25,"category_name":123,"show_sort_weight":124,"slug":125},7,"Healthcare",40,"healthcare",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":127,"show_sort_weight":128,"slug":129},"Research & Report",30,"research-report",{"id":131,"doc_module":4,"doc_module_name":25,"category_name":132,"show_sort_weight":133,"slug":134},9,"Religion & Spirituality",20,"religion-spirituality",{"id":133,"doc_module":4,"doc_module_name":25,"category_name":136,"show_sort_weight":133,"slug":137},"World Cup","world-cup",{"id":139,"doc_module":4,"doc_module_name":25,"category_name":140,"show_sort_weight":139,"slug":141},10,"Lifestyle","lifestyle",{"id":91,"doc_module":4,"doc_module_name":25,"category_name":143,"show_sort_weight":112,"slug":144},"General","general"]