JavaScript

How do you create an empty array in JavaScript?

• let arr = new Array();

• let arr = [ ];

• let arr = ( );

• let arr = null;

Which method do you use to add elements to the end of an array?

• add()

• push()

• append()

• concat()

How do you remove the last element from an array?

• removeLast()

• deleteLast()

• pop()

• splice()

What will be the output of the following code snippet?

let fruits = ['apple', 'banana', 'orange'];

fruits.pop();

console.log(fruits.length);

• 0

• 1

• 2

• 3

What method do you use to join all elements of an array into a single string?

• join()

• concat()

• merge()

• combine()

What is the index of the first element in an array?

• 0

• 1

• -1

• 10

What is the output of the following code?

let array = [1, 2, 3, 4, 5];

array.length = 0;

console.log(array)

• [ ]

• { }

• [1,2,3,4,5]

• 5

How do you remove elements from an array, starting from a specific index?

• removeFromIndex()

• splice()

• cut()

• deleteFromIndex()

How do you find the index of a specific element in an array?

• findIndex()

• indexOf()

• searchIndex()

• getElementIndex()

What will be the output of the following code snippet?

let numbers = [10, 20, 30];

numbers[1] = 50;

console.log(numbers);

• [10, 20, 30]

• [10, 50, 30]

• [20, 30, 10]

• [50, 10, 30]