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JavaScript - Interview Questions and Answers for 'JavaScript' - 35 question(s) found - Order By Newest

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  Q1. What is a cookie ?Java EE
Ans. A cookie is a small piece of text stored on a user's computer by the browser for a specific domain. Commonly used for authentication, storing site preferences, and server session identification.

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   Like         Discuss         Correct / Improve     cookie   javascript   web application   session management   browser   j2ee     Asked in 16 Companies      basic        frequent


 Q2. Which of the following is fastest to locate the DOM element ?

a. document.getElementById
b. document.getElementByName
c. document.ElementName.SubElementName
d. They all result in similar performance in retrieving the DOM element.
Ans. document.ElementName.SubElementName

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   Like         Discuss         Correct / Improve     html   dom   javascript


 Q3. Why should we have Javascript method definitions within HTML Head section ?

a. Its safe to have javascript code within head section
b. Head section gets loaded even if there is any error in loading HTML page
c. Head section gets executed first and hence assure that js method definition will be loaded before they are called
d. So that we can have method definition and method call at the same place
Ans. Head section gets executed first and hence assure that js method definition will be loaded before they are called

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   Like         Discuss         Correct / Improve     html   head section   javascript


 Q4. What is event bubbling ?JavaScript
Ans. LinkedIn

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   Like         Discuss         Correct / Improve     event bubbling  events     Asked in 1 Companies


 Q5. What is event handling ? What is event propagation ?JavaScript
Ans. LinkedIn

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   Like         Discuss         Correct / Improve     event habdling  event propagation  events     Asked in 1 Companies


 Q6. What are falsy attributes in javascript ?Javascript
Ans. A falsy value is something which evaluates to FALSE, for instance when checking a variable. There are only six falsey values in JavaScript: undefined, null, NaN, 0, "" (empty string), and false of course.

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 Q7. Difference between Scriptlet and JSTL.Javascript
 This question was recently asked at 'Hexaware'.This question is still unanswered. Can you please provide an answer.


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 Q8. How would you choose your favorite company name for e.g. three companies are given in radio buttons Infosys, TCS and Aricent. Do You need to loop trough all radio buttons and select your favorite company or can just get the selected value.Javascript
 This question is still unanswered. Can you please provide an answer.


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 Q9. what is event handler script ?JavaScript
 This question was recently asked at 'American Express'.This question is still unanswered. Can you please provide an answer.


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 Q10. How can java script access a database ?JavaScript
 This question was recently asked at 'American Express'.This question is still unanswered. Can you please provide an answer.


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 Q11. Which statement is used to exit a function in java script ?JavaScript
Ans. return

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 Q12. What is the difference between Java OR operator and Java script OR operator ?JavaScript
 This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer.


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 Q13. How do you debug Javascript code ?JavaScript
Ans. Possible Answer - I use either Firebug or Chrome Developer tool.

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  Q14. Difference between == and === ?JavaScript
Ans. == compares values === is used in scripting languages for comparing two values as well as there data tpe. like in js,php.

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   Like         Discuss         Correct / Improve     ==  ===  == vs ===     Asked in 13 Companies      basic        frequent


 Q15. What is type script ? What are the advantages of typescript ? How is it different than javascript ?TypeScript
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     Typescript vs Javascript


 Q16. What is the use of this keyword in javascript ?Javascript
Ans. This keyword refers to the current instance of the class.

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 Q17. What does 'variable hoisting' mean? JavaScript
Ans.

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 Q18. How do you debug Javascript code ?Javascript
 This question is still unanswered. Can you please provide an answer.


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 Q19. What is Defer Parsing JavaScript ?JavaScript
 This question is still unanswered. Can you please provide an answer.


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 Q20. What is the difference between inheritance in PHP vs. Javascript?JavaScript
 This question was recently asked at 'WePay'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     php  javascript     Asked in 1 Companies


 Q21. Write a method to track every click on a page.JavaScript
 This question was recently asked at 'LinkedIn'.This question is still unanswered. Can you please provide an answer.


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 Q22. Have you had to work with memory leak problems in javascript ?JavaScript
 This question was recently asked at 'RockYou'.This question is still unanswered. Can you please provide an answer.


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 Q23. prototypal inheritance in JavascriptJavaScript
 This question was recently asked at 'RocketMiles'.This question is still unanswered. Can you please provide an answer.


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 Q24. Difference between Let and Var in Javascript ?JavaScript
Ans. Var scopes the variable to the nearest function whereas Let scopes the variable to nearest block.

For example -

function printNumbers() {
for(var i = 1; i < 3: i++){
console.log(i);
}

console.log(i); // works fine and will print 3 as i has a function scope and not local loop scope
}

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   Like         Discuss         Correct / Improve     let vs var in javascript  let vs var   difference between let and var


 Q25. What are benefits of strongly typing variables ?JavaScript
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     strong typing javascript


 Q26. How is the declaration of enum in Typescript differ from Javascript ?TypeScript
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     enum typescript  enum javascript


 Q27. How Object-Oriented Programming is implemented in JavaScript? How they differ from other languages?Javascript
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     object oriented programming in javascript  oops in javascript


 Q28. How is cohesion achieved in JavaScript ?JavaScript
 This question is still unanswered. Can you please provide an answer.


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 Q29. what is strict mode in javascript ? How is it used ?Javascript
 This question is still unanswered. Can you please provide an answer.


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 Q30. Have you ever used sessionStorage ? What is the better way to store session information - sessionStorage or session cookie ?Session Management
Ans. Session Cookie, because session storage can be accessed from XSS (Cross site Scripting) attacks but cookies (if set with "HttpOnly" and "Secure" flags) are more safer against these attacks.

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   Like         Discuss         Correct / Improve     SessionStorage  session cookie  session management  javascript


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