JS - Arrays and Objects

What is first index value of an array?

• 2

• -1

• 0

• 1

What is the name of the JavaScript standard?

• JavaScript

• ECMA Script (ES)

• JS

• PEP

The _________ method is used to add a new element to an array

• add()

• insert()

• push()

• set()

• All the above

Array elements can be deleted using which of these methods?

• pop()

• shift()

• both pop() and shift()

• none of the above

What will be the output of this code?

• [8, 6, 7, 9]

• [4]

• 8, 6, 7, 9

• 4

What does the 3-dot operator (…) do in JS?

• It is used to spread iterables to individual elements

• It is used to describe a datatype of undefined size

• No such operator exists

• None of the above

• 20

• 25

• undefined

• None of the above

• {first: 20, second: 30}

• {first: 50, second: 30}

• {first: 20, second: 30, first: 50}

• {second: 30, first: 50}

……………… method in JavaScript concatenates all the elements of an array to generate a string.

• slice()

• concat()

• splice()

• join()

• [1,2,3,4,5]

• [2]

• [2,4,6,8,10]

• [undefined, undefined, undefined, undefined, undefined]