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Caching And Debugging MCQ question and answer in javascript with solution

Learn Caching And Debugging MCQ Questions and answers in javascript with easy and logical explanations. Caching And Debugging MCQ question in Javascript which provides all type of technical mcq questions which is important for technical exams, cumpus exams and other entrance examination Page-1 section-2

Each section contains 100 MCQs on Caching and Debugging .
1
Which is the function used to loop in an array to view all the values?
Discuss
Answer & Solution
Answer: Option C
Solution:
The method jQuery.each(array, function) loops through the array.
2
Which of the following has a greater benchmark time for looping and JQuery vs core JavaScript in milliseconds?
Discuss
Answer & Solution
Answer: Option A
Solution:
When we try to compare the average benchmark time for looping and JQuery vs core JavaScript in milliseconds, the Chrome JQuery has a greater benchmark time.
3
Which class provides an interface for invoking JavaScript methods and examining JavaScript properties?
Discuss
Answer & Solution
Answer: Option B
Solution:
When a JavaScript object is passed or returned to Java code, it is wrapped in an instance of JSObject. When a JSObject instance is passed to the JavaScript engine, it is unwrapped back to its original JavaScript object. The JSObject class provides a way to invoke JavaScript methods and examine JavaScript properties.
4
What is the purpose of the function eval?
Discuss
Answer & Solution
Answer: Option C
Solution:
eval is a JavaScript native function that accepts a string and executes the string as JavaScript. It basically fires up the interpreter and allows the passed-in string to be parsed and interpreted at the time of invocation.
5
Which of the following has a lesser benchmark time for using JQuery to access DOM versus pure JavaScript in milliseconds?
Discuss
Answer & Solution
Answer: Option D
Solution:
When we try to compare the average benchmark time for using JQuery to access DOM versus pure JavaScript in milliseconds, the Firefox JSDOM_benc has a lesser benchmark time.
6
Which is a wrapped Java array, accessed from within JavaScript code?
Discuss
Answer & Solution
Answer: Option A
Solution:
JavaArray is accessed from within JavaScript code.
7
What is the syntax of close method for document object?
Discuss
Answer & Solution
Answer: Option D
Solution:
In order to close a document object, we need to call Close().
8
How do you find the number with the highest value of x and y?
Discuss
Answer & Solution
Answer: Option D
Solution:
Math.max(x,y) is used to find the highest value of x and y.
9
How can you find a client’s browser name?
Discuss
Answer & Solution
Answer: Option B
Solution:
The client’s browser name can be found by using navigator.appName.
10
Which of the following is not a JavaScript framework?
Discuss
Answer & Solution
Answer: Option D
Solution:
Dojo Toolkit is an open source modular JavaScript library (or more specifically JavaScript toolkit) designed to ease the rapid development of cross-platform, JavaScript/Ajax-based applications and web sites.