/  JavaScript-arrays-Quiz

This Quiz contains totally 10 Questions each carry 1 point for you.

1. The method or operator used to identify the array is
isarrayType()
==
===
type of

### Wrong!

2. The primary purpose of the array map() function is that it

maps the elements of another array into itself
passes each element of the array and returns the necessary mapped elements
passes each element of the array on which it is invoked to the function you specify, and returns as array containing the values returned by that function
none of the mentioned

### Wrong!

3. What is the observation made in the following JavaScript code?

var count = [1,,3];
The omitted value takes “undefined”
This results in an error
This results in an exception
The omitted value takes an integer value

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

int sum=0;

var arr = [10,15,20,30];

arr.forEach(function myFunction(element)

{

sum= sum+element;

});

document.writeln(sum);
70
75
10
error

### Wrong!

5. What is the value of passed in the following code?

var marks = [30, 35, 42, 20, 15];

var passed = marks.every(function(m) {

return m > 40;

});
true
false
42
NONE

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6. Consider the following code snippet

var a = [ 1,2,3,4,5 ];

a . slice( 0,3 );

what is the possible output for the above code snippet:
Returns [1,2,3]
Returns [4,5]
Returns [1,2,3,4]
Returns [1,2,3,4,5]

### Wrong!

7. The pop() method of the array does which of the following task?
decrements the total length by 1
increments the total length by 1
prints the first element but no effect on the length

### Wrong!

8. How to access the second element of the array arr = [3, 7, 10]?
arr.indexOf(2)
arr.indexOf(1)
arr[2]
arr[1]

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9. How to replace the second element in the array arr = [1, 7, 9] with the value 8?
arr[1] = 8
arr[2] = 8
arr.indexOf(1) = 8
None

### Wrong!

10. What will the following code log?

var arr = [1, 66, 20];

arr.length = 0;

console.log(arr[0]);
0
1
undefined
It throws an error

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Javascript – Arrays – Quiz

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