Which operator checks both value and type for equality in JavaScript?

How do you declare a variable with an undefined value?

A). let x;

B). let x = '';

C). let x = 0;

D). let x = null;

What will typeof [1, 2, 3] return?

A). array

B). object

C). number

D). list

What is the data type of an array in JavaScript?

A). Array

B). Object

C). Collection

D). List

What is the data type of true in JavaScript?

A). String

B). Boolean

C). Number

D). Object

What is the output of typeof function() {}?

A). function

B). object

C). undefined

D). number

What is the result of null === undefined?

A). 1

B). 0

C). Error

D). NaN

What is the data type of 42 in JavaScript?

A). String

B). Boolean

C). Number

D). Object

Which function can convert a number to a string in JavaScript?

A). toString()

B). parseInt()

C). String()

D). Number()

Which method can be used to convert a string to a number in JavaScript?

A). parseInt()

B). toString()

C). toNumber()

D). parseStr()

What is the output of '5' + 3?

A). 8

B). 53

C). 8

D). Error