Javascript interview questions part 30
Javascript interview questions part 30
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Total Questions: 20
1. Consider the following code snippet function f(o) { if (o === undefined) debugger; } What could be the task of the statement debugger?
Correct Answer is : It does nothing but a simple breakpoint
2. Among the keywords below, which one is not a statement?
Correct Answer is : use strict
3. The functions provide() and require() of Dojo toolkit and Google’s Closure library are used for
Correct Answer is : declaring and loading modules
4. The maximum number of global symbols a module can define is ____________
Correct Answer is : 1
5. To define each of the set classes as a property of the sets object (namespace) for the module, the statement is
Correct Answer is : sets.SingletonSet = sets.AbstractEnumerableSet.extend(...);
6. Consider the following statement var Set = sets.Set; var s = new Set(1,2,3); What could be the efficiency quotient of the above two statements ?
Correct Answer is : The programmer imports at once the frequently used values into the global namespace
7. The scope of a function is also called as ________
Correct Answer is : Module function
8. Modules that have more than one item in their API can ________
Correct Answer is : Return a namespace object
9. The provides() function and the exportsobject are used to _________
Correct Answer is : Register the module’s API and Store their API
10. What could be achieved by running the code snippet below? var sets = com.davidflanagan.collections.sets;
Correct Answer is : Importing the entire module
11. The properties() method is a ________
Correct Answer is : Non-enumerable method
12. What can be done in order to avoid creation of global variables in JavaScript?
Correct Answer is : To use an object as its namespace
13. The events that are not triggered directly by user activity are called
Correct Answer is : State change events
14. The video and the audio belong to the
Correct Answer is : API-Specific events
15. The client-side JavaScript asynchronous programming model contains
Correct Answer is : Timers and error handlers
16. Which are the events that have default actions that can be canceled by event handlers?
Correct Answer is : Submit and reset events
17. The events that represents occurrences related to the browser window are
Correct Answer is : Window
18. Which event is fired when a document and all of its external resources are fully loaded and displayed to the user?
Correct Answer is : Load
19. Which is the alternative to the load event?
Correct Answer is : readystatechange
20. Which is the opposite to the load event in JavaScript?
Correct Answer is : unload
