Javascript interview questions part 41
Javascript interview questions part 41
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Total Questions: 20
1. What is the code to be used to trim whitespaces ?
Correct Answer is : let trimmed = (l.trim() for (l in lines));
2. What will be the reaction when a catch clause has no conditionals?
Correct Answer is : Takes it to be true
3. When will the finally block be called?
Correct Answer is : After try-catch execution
4. What is the return type of typeof for standard JavaScript objects?
Correct Answer is : object
5. Which method to use while working with XML fragments, instead of XML()?
Correct Answer is : XMLList()
6. Which of the following is the descendant operator?
Correct Answer is : …
7. Which of the following is an example to perform the most common XML manipulations using the XML objects invocation?
Correct Answer is : insertChildBefore()
8. What is the code required to delete all “weight” tags?
Correct Answer is : delete pt..weight;
9. JavaScript is a _______________ language.
Correct Answer is : Object-Based
10. What would be the most appropriate output for the following code snippet? var a=5 , b=1 var obj = { a : 10 } with(obj) { alert(b) }
Correct Answer is : 1
11. A conditional expression is also called a _______________
Correct Answer is : Immediate if
12. Which is a more efficient code snippet? Code 1 : for(var num=10;num>=1;num--) { document.writeln(num); } Code 2 : var num=10; while(num>=1) { document.writeln(num); num++; }
Correct Answer is : Code 1
13. What is block statement in JavaScript?
Correct Answer is : block that combines multiple statements into a single compound statement
14. When an empty statement is encountered, a JavaScript interpreter __________
Correct Answer is : Ignores the statement
15. The “var” and “function” are __________
Correct Answer is : Declaration statements
16. Consider the following statements switch(expression) { statements } In the above switch syntax, the expression is compared with the case labels using which of the following operator(s)?
Correct Answer is : #ERROR!
17. What happens in the following javascript code snippet? var count = 0; while (count < 10) { console.log(count); count++; }
Correct Answer is : The value of count from 0 to 9 is displayed in the console
18. The enumeration order becomes implementation dependent and non-interoperable if:
Correct Answer is : If the object inherits enumerable properties
19. When are the mouse events generated?
Correct Answer is : When user clicks or moves the mouse over a document
20. The properties that specify the position and button state of the mouse are
Correct Answer is : clientX and clientY
