JavaScript Questions

March 14, 2023

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Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

Deprecated: trim(): Passing null to parameter #1 ($string) of type string is deprecated in /home/u797631661/domains/codermantra.com/public_html/wp-includes/formatting.php on line 449

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JavaScript Questions

1 / 15

1. What does the ‘toLocateString()’ method do in JS?

A. Returns a localised object representation

B. Returns a localised string representation of an object

C. Returns parsed string

D. None of the above

2 / 15

2. Which is the function used to call a function in every time duration?

A. callafter()

B. setInterval()

C. setTimeout()

D. setTime()

3 / 15

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

let x = "10";
    let y = + x;
    
    document.write(typeof y);

A. string

B. object

C. undefined

D. number

4 / 15

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

let sum = 0; 
const a = [1, 2, 3];
a.forEach(getSum);
print(sum);
function getSum(ele) {
   sum += ele;
}

A. 2

B. 1

C. 6

D. None of the above

5 / 15

5. How does forEach() method differ from a for statement?

A. forEach allows you to specify your own iterator, whereas for does not.

B. forEach can be used only with strings, whereas for can be used with additional data types.

C. forEach can be used only with an array, whereas for can be used with additional data types.

D. for loops can be nested; whereas forEach loop cannot.

6 / 15

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

function printArray(a) 
{
     var len = a.length, i = 0;
     if (len == 0)
        console.log("Empty Array");
     else 
     {
// do-while loop in javascript
         do 
         {
             console.log(a[i]);
         } while (++i < len);
     }
}

A. Prints “Empty Array”

B. Prints 0 to the length of the array

C. Prints the numbers in the array in order

D. Prints the numbers in the array in the reverse order

7 / 15

7. What will be the output of the following code snippet?

let a = [1, 2, 3, 4, 5, 6];
var left = 0, right = 5;
var found = false;
var target = 5;
while(left <= right) {
   var mid = Math.floor((left + right) / 2);
   if(a[mid] == target) {
       found = true;
       break;
   }
   else if(a[mid] < target) {
       left = mid + 1;
   }
   else {
       right = mid - 1;
   }
}
if(found) {
   print("YES");
}
else {
   print("NO");
}

A. YES

B. NO

C. Syntax Error

D. None of the above

8 / 15

8. What will be the output of the following code snippet?

var x=12;
var y=8;
var res=eval("x+y");
document.write(res);

A. 20

B. x+y

C. 128

D. None of the above

9 / 15

9. Which of the following is not a vaid javascript variable.?

A. 2names

B. _first_and _lastname

C. FirstAndLast

D. first2last

10 / 15

10. What is the main difference between var and let keywords in JavaScript?

A. var defines a variable while let defines a constant

B. var defined function scoped variable while let define block scoped variable

C. he value of a variable declared with var can be changed while the value of a variable declared with let cannot be changed

D. all of the above

11 / 15

11.

Which one of the following is correct output for the following given JavaScript code if there is a p tag with id=demo ?
functionourFunction()
{
document.getElementById("demo").innerHTML=Math.abs(-7.25);
}

A. 7

B. -7.25

C. -7

D. 25

12 / 15

12. The "function" and " var" are known as:

A. Keywords

B. Data Types

C. Declaration Statements

D. Prototypes

13 / 15

13. Which statement is used to skip the iteration of the loop

A. break

B. pass

C. skip

D. continue

14 / 15

14. Which statement creates a new object using the Person constructor?

A. var student = construct Person;

B. var student = new Person();

C. var student = Person();

D. var student = construct Person();

15 / 15

15. Which JavaScript statements when embedded in an HTML page can respond to user events such as mouse clicks, form input and page navigation

A. Native

B. Server-Side

C. Local

D. Client-Side

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