Javascript interview questions part 34
Javascript interview questions part 34
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Total Questions: 20
1. What is the purpose of the UgilifyJS?
Correct Answer is : Both Exposes a simple API and Minification
2. Which of the following is the fastest JavaScript parser?
Correct Answer is : Acron
3. The ‘$’ present in the RegExp object is called a ____________
Correct Answer is : metacharacter
4. Consider the following statement containing regular expressions var text = "testing: 1, 2, 3"; var pattern = /\d+/g; In order to check if the pattern matches, the statement is
Correct Answer is : pattern.test(text)
5. The regular expression to match any one character not between the brackets is __________
Correct Answer is : [^…].
6. What does /[^(]* regular expression indicate?
Correct Answer is : Match zero or more characters that are not open parenthesis
7. What will be the result when non greedy repetition is used on the pattern /a+?b/?
Correct Answer is : Matches the letter b preceded by the fewest number of a’s possible
8. What does the subexpression /java(script)?/ result in?
Correct Answer is : It matches “java” followed by the optional “script”
9. What is the most essential purpose of parantheses in regular expressions?
Correct Answer is : Define subpatterns within the complete pattern
10. The method that performs the search-and-replace operation to strings for pattern matching is _______
Correct Answer is : replace()
11. What would be the result of the following statement in JavaScript using regular expression methods?
Correct Answer is : Returns [“123″,”456″,”789”].
12. Consider the following code snippet var pattern = /Java/g; var text = "JavaScript is more fun than Java!"; var result; while ((result = pattern.exec(text)) != null) { alert("Matched '" + result[0] + "'" +" at position " + result.index +"; next search begins at " + pattern.lastIndex); } What purpose does exec() solve in the above code?
Correct Answer is : Returns the same kind of array whether or not the regular expression has the global g flag
13. How do we define the term Thread?
Correct Answer is : Controlled execution of applications
14. What does the browser do to set up a TCP/IP connection?
Correct Answer is : TCP three-way handshake
15. What does the handshake pass between the browser and the remote server?
Correct Answer is : Synchronize
16. How does the handshake help the server?
Correct Answer is : Both Acknowledge and Accept the attempt
17. What is the purpose of the transport layer?
Correct Answer is : Both TCP and UDP Communication takes place
18. What does the status code 200 indicate?
Correct Answer is : Successful
19. What does the status code 500 indicate?
Correct Answer is : Error in request
20. What does the application layer handle?
Correct Answer is : Top-level communication
