Javascript interview questions part 8
Javascript interview questions part 8
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Total Questions: 20
1. Which is more widely used than GWT in Google?
Correct Answer is : Closure
2. Which are the forms of client-side storage?
Correct Answer is : All of the mentioned
3. Which is the storage that allows the caching of web pages and their associated resources?
Correct Answer is : Offline Web Applications
4. Which is the Microsoft’s own proprietary client-side storage?
Correct Answer is : IE User Data
5. Which object supports Filesystem API?
Correct Answer is : File
6. Which is the most appropriate database for developers requiring a huge amount of data?
Correct Answer is : Web databases
7. The localStorage and sessionStorage belongs to ___________
Correct Answer is : Window object
8. What is the main difference between localStorage and sessionStorage?
Correct Answer is : Both Lifetime and Scope
9. What is the lifetime of the data stored through localStorage?
Correct Answer is : Permanent
10. Which is the function used to retrieve a value?
Correct Answer is : getItem()
11. Which is the function used to store a value?
Correct Answer is : setItem()
12. What kind of scoping does JavaScript use?
Correct Answer is : Lexical
13. What must be done in order to implement Lexical Scoping?
Correct Answer is : Reference the current scope chain
14. What is a closure?
Correct Answer is : Both Function objects and Scope where function’s variables are resolved
15. Which of the following are examples of closures?
Correct Answer is : All of the mentioned
16. Which of the following uses a lot of CPU cycles?
Correct Answer is : Dynamically generated graphics
17. Consider the following code snippet : var scope = "global scope"; function checkscope() { var scope = "local scope"; function f() { return scope; } return f; } What is the function of the above code snippet?
Correct Answer is : Returns the value in scope
18. What is the fundamental rule of lexical scoping?
Correct Answer is : Functions are executed using scope chain
19. What is the opposite approach to the lexical scoping?
Correct Answer is : Dynamic scoping
20. What is the purpose of the dynamic scoping?
Correct Answer is : Variables can be declared outside the scope
