JavaScript Interview Questions You'll Most Likely Be Asked

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JavaScript Interview Questions You'll Most Likely Be Asked is a perfect companion to stand ahead above the rest in today’s competitive job market. Rather than going through comprehensive, textbook-sized reference guides, this book includes only the information required immediately for job search to build an IT career. This book puts the interviewee in the driver's seat and helps them steer their way to impress the interviewer. 
 
Table of Contents
1. Introduction to JavaScript
2. Statements, Comments and Variables
3. Operators and Functions
4. Values, Arrays and Operators
5. Modules, Characters and Attributes
6. Event Handlers and DOM
7. Keywords, CSS and CSS2
8. Statements and Functions
9. Roles of JavaScript, Scripts and Events
10. Opening and Manipulating Windows
11. Objects and their Properties in JavaScript
12. JavaScript and HTML
13. JavaScript Forms
14. JavaScript Constructors
15. Miscellaneous Arguments, Functions and Methods in JavaScript
16. JavaScript Design Patterns
HR Interview Questions
INDEX
 
Includes:
a) 264 JavaScript Interview Questions, Answers and proven strategies for getting hired as an IT professional
b) Dozens of examples to respond to interview questions
c) 77 HR Questions with Answers and proven strategies to give specific, impressive, answers that help nail the interviews
d) 2 Aptitude Tests download available on  www.vibrantpublishers.com
 
Bisac
COM051260 - Computers / Programming Languages / JavaScript
COM051280 - COMPUTERS / Programming Languages / Java
COM051010 - COMPUTERS / Programming Languages / General
 
Sample from the book
(Below Questions and Answers are randomly taken from different pages of the book)
 
17: What is the difference in evaluating [“8”+5+2] and [8+5+”2”]?
Answer:
In [“8”+5+2],”8” is a String. So anything that trail the string will be changed to string. Hence the result will be”852”.
In [8+5+”2”], 8 and 5 are integer, so it gets added up (13).And “2” is treated as String. Hence the concatenation takes place and the result will be “132”.
 
75: What are the event handlers in JavaScript?
Answer:
Event handlers are the JavaScript code that can be used inside the Html tags and gets executed when any events such as form submission, page loading occur. Some of the event handlers in JavaScript are:
a) onload
b) onunload
c) onclick
d) onmouseout
e) onmouseover
 
198: What other JavaScript method you know that is similar with shift() method?
Answer:
Other method similar with shift() is Array.pop(), the only exception is that it operates on the beginning of an array rather that the end.
 
263: Explain about Mediator pattern.
Answer:
Irrespective of the applications are small or large, applications are made of unique objects. All these unique objects need a way to communicate among themselves in a manner that doesn’t affect maintenance and the ability to safely change a part of the application without breaking the rest of it. This is where Mediator pattern plays an important role.
When the application grows, we add objects one by one and it grows rapidly. Then, during refactoring, objects are removed and rearranged. When objects know too much about each other and communicate directly by calling each other’s methods and change the properties, it leads to undesirable tight coupling.
When objects are closely coupled, it’s not easy to change one object without affecting many others. Then even the simplest change in an application is no longer trivial, and it’s virtually impossible to estimate the time a change might take. The mediator pattern alleviates this situation by promoting loose coupling and helping to improve maintainability.
 
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