JavaScript Online Test

1. What is the purpose of the UgilifyJS?

2. What will be the output of the following JavaScript code?

var  obj=
{
	length:20,
	height:35,
}
if (‘breadth' in obj === false) 
{
  	obj.breadth = 12;
}

console.log(obj.breadth);

3. What will be the output of the following JavaScript code?

function counth2()
{  
    var totalh2=document.getElementsByTagName("h2");  
    alert("totalh2.length);  
}  
<h2>hello</h2>  
<h2>hello</h2> 

4. What will be the output of the following JavaScript code?

       console.log(Pattern.matches("[amn]", "abcd"));

5. What will be the output of the following JavaScript code?

let size = 5;
let a = 5;
for (let j = size; j >= 0; j=a) {
    document.write(a);
    a = a - 2;
}

6. What is the difference between the two lines in the following JavaScript code?

!!(obj1 && obj2);
(obj1 && obj2);

7. Which is the method that removes the current document from the browsing history before loading the new document?

8. Which identifier is used to represent a web browser window or frame?

9. What is the purpose of data format validation?

10. The style property belongs to which of the following object?

11. How do you find the number with the highest value of x and y?

12. Which property lays the element according to the normal flow?

13. How to get a particular value using the tagged name?

14. Which of the following layer retrieves the content from the network?

15. How many methods are there in the History object?

16. The basic purpose of the toLocaleString() is to _________

17. What is the purpose of the method ActiveXObject()?

18. What will be the output of the following JavaScript statement?

var grand_Total=eval("10*10+5");

19. Which tag can handle mouse events in Netscape?

20. The blobs are generally stored in ____________

21. A JavaScript program developed on a Unix Machine ________

22. The code of the R language has an extension?

23. What is the lifetime of the data stored through localStorage?

24. How can we make methods available on all objects?

25. Which of the following is not the value the key property will hold if the key is a function key?

26. Which of the following can be used to configure the scope of the Cookie visibility?

27. How many reserved words are there in JavaScript?

28. Which is the game that requires extremely minified source in the Perl culture?

29. What will be the output of the following JavaScript code?

var b5 = Boolean('false');
document.getElementById("demo").innerHTML =b5;

30. Which of the following is not a WebSocket event?

31. Which of the following method loads a new document?

32. What will be the output of the following JavaScript code?

<p id="demo"></p>
<script>
var x = 'It\'s';
document.getElementById("demo").innerHTML = x ; 
</script>

33. What is the procedure to view the console in the Firefox?

34. What is the purpose of the assign() method?

35. Why do we need to create locally scoped variables to hold value?

36. Do functions in JavaScript necessarily return a value?

37. What will be the output of the following JavaScript code?

<p id="demo"></p>
<script>
function myFunction() 
{
   var str = "Hellooo World!"; 
   var patt1 = /o+/g;
   var result = str.match(patt1);
   var count=0;
   While(result[i]!=NULL)
   {
       If(result[I]==o)
       count++;
   }
   document.getElementById("demo").innerHTML = count;
}
</script>

38. What will be the output of the following JavaScript code?

<p id="demo"></p>
<script>
function myFunction() 
{
     document.getElementById("demo").innerHTML = Math.LN10;
}
</script>

39. What will be the output of the following JavaScript code?

<p id="demo"></p>
<script>
var x = 9.656;
document.getElementById("demo").innerHTML =
  x.toFixed(0)
</script>

40. Which of the following navigator object properties is the same in both Netscape and IE?

41. What is the advantage of the code produced graphics being smaller than the images themselves?

42. The video and the audio belong to the _________

43. What would be the result or type of error if p is not defined in the following JavaScript code snippet?

console.log(p)

44. What will be the output of the following JavaScript code?

function output(object)
{
	var place=object ? object.place : “Italy”;
	return “clean:”+ place;
}
console.log(output({place:India}));

45. What is a heap in JavaScript?

46. The main purpose of JavaScript in web browser is to ___________

47. What will be the output of the following JavaScript code if oddsums(5); is executed after the following code snippet?

function oddsums(n) 
{
     let total = 0, result=[]; 
     for(let x = 1; x <= n; x++) 
     { 
        let odd = 2*x-1; 
        total += odd;
        result.push(total);
     }
     return result;
}

48. When is an application said to show a web performance?

49. What are the goals for using Firebug?

50. Which of the following is not the property of the video tag?