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C# Interview Questions and Answers with PDF Download
JavaScript interview questions and answers. This content is also available as a downloadable PDF. Keep your engineering skills up to date by signing up for TechRepublic's free Software. This is where you will find the comprehensive PDF job interviews that extend beneath the common job interview questions. Click on your career category link to view and download interview questions and answers. Questions asked in Javascript job Interview and their answers;. Basic Core Java Interview Questions: Q1. What is the difference between an Inner Class and a Sub-Class? Ans: An Inner class is a class which is nested within another class. An Inner class has access rights for the class which is nesting it and it can access all variables and methods defined in .
Javascript interview questions and answers pdf free download
My first adventures in Web development were brightened with the introduction of JavaScript anybody remember LiveScript? For many years, the language was shunned by self-proclaimed real developers, but there has been an about-face within the industry, with JavaScript now viewed as a major vehicle for building powerful Web applications and beyond think Node. When the time comes to hire JavaScript developers, the following interview questions and talking points might help.
The depth and focus of an interview will depend on the position's requirements, so you can choose to go further with some questions or avoid topics based on your needs.
I hope these questions will stimulate a discussion that gives you a peek into what the candidate knows and how the person works. Note: This content is also available as a downloadable PDF. Global variables are available throughout your code: that is, the variables have no scope. Local variables scope, on the other hand, is restricted to where it is declared like within a function.
The var keyword is used javascript interview questions and answers pdf free download declare a local variable or object, while omitting the var keyword creates a global variable. Most JavaScript developers avoid globals.
One reason why is they're averse to naming conflicts between local and globals, Also, code that depends on globals can be difficult to maintain and test. The key concept here is to get an idea of how the candidate maintains and designs code.
Do they design code that is specific to an application with no possible reuse? Do they use class inheritance or the module pattern to build reusable code? These approaches allow multiple developers to work on a project without stepping on their coworkers' toes.
In addition, testing modular code or classes is easier to approach than a jumbled mess of code thrown together look around the Web, and you'll find plenty of examples. Unlike Java or CJavaScript is a loosely-typed language some call this weakly typed ; this means that no type declarations are required when variables are created. Strings and numbers can be intermixed with no worries. JavaScript is smart, so it easily determines what the type javascript interview questions and answers pdf free download be.
The value of a variable with no value is undefined i. Variables can be emptied by setting their value to null. The big difference is the latter uses coercion, javascript interview questions and answers pdf free download, which can have some odd results -- it returns true for a null or undefined comparison if they are either.
JavaScript's this keyword normally refers to the object that owns the method, but it depends on how a function is called. Basically, it points to the currently in scope object that owns where you are in the code. When working within a Web page, this usually refers to the Window object.
If you are in an object created with the new keyword, the this keyword refers to the object being created. When working with event handlers, JavaScript's this keyword will point to the object that generated the event. Event bubbling describes the behavior of events in child and parent nodes in the Document Object Model DOM ; that is, all child node events are automatically passed to its parent nodes, javascript interview questions and answers pdf free download.
The benefit of this method is speed, because the code only needs to traverse the DOM javascript interview questions and answers pdf free download once. This is useful when you want to place more than one event listener on a DOM element since you can put just one listener on all of the elements, thus code simplicity and reduction.
One application of this is the creation of one event listener on a page's body element to javascript interview questions and answers pdf free download to any click event that occurs within the page's body. This open-ended question has the potential to spawn a good conversation. There are the vastly popular frameworks like jQueryalthough you might be surprised when the person tells you about the framework they developed or even played the contributor role.
The answer to the second question gives you an idea of the candidate's feelings about open source well, that is the way I see it. There are so many open source options available today Knockoutpostal. These open source options provide robust code that has been thoroughly tested by an army of developers. From my perspective, I want developers who will use whatever is available to meet a project's demands.
Plus, the interviewee might introduce you to something you've never used. This is the same way it works in other languages like C and Java. You can give bonus points to any candidate who discusses the onerror event handler tied to the Window object in the browser -- this allows it to monitor all errors on a page.
This allows you to properly handle code syntax errors and runtime exceptions. This subject confuses many developers, and I would expect a candidate to stammer on this question or throw up their hands and say "can anybody? Timers allow you to execute code at a set time or repeatedly using an interval. This is accomplished with the setTimeout, setInterval, and clearInterval functions.
The setTimeout function, delay function initiates a timer that calls a specific function after the delay; it returns an id value that can be used to access it later. The setInterval function, javascript interview questions and answers pdf free download, delay function is similar to the setTimeout function except that it executes repeatedly on the delay and only stops when cancelled.
The clearInterval id function is used to stop a timer. Timers can be tricky to use since they operate within a single thread, thus events queue up waiting to execute. He currently focuses on.
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JavaScript Tutorial for Beginners: Learn JavaScript in 1 Hour [2019]
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Aug 08, · Download absolutely free JavaScript JOB interview questions and answers guide in PDF format. Download absolutely free JavaScript JOB interview questions and answers guide in PDF format. Interview Questions And Answers Guide. Global Guideline - Interviewer and Interviewee Guide. Jun 21, · The list of C# Interview Questions and Answers is also available for download as PDF file. C# is an enormous programming language with many concepts which is being constantly updated by Microsoft and hence the list of C# Interview Questions and Answers cannot be constant. Jul 15, · Below is the list of latest and updated JavaScript interview questions and their answers for freshers as well as experienced users. These interview questions will help you to prepare for the interviews, So let's start. JavaScript Interview Questions for both Experienced Programmers and Freshers. 1) What is JavaScript?/5(76).
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