What is the data type of an array in JavaScript?

Which of the following is a falsy value in JavaScript?

A). 0

B).

C). null

D). All of the above

How do you declare a variable with an undefined value?

A). let x;

B). let x = '';

C). let x = 0;

D). let x = null;

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

A). toString()

B). parseInt()

C). String()

D). Number()

What will typeof NaN return?

A). number

B). NaN

C). undefined

D). object

What is the result of typeof undefined?

A). undefined

B). null

C). object

D). number

Which of the following is not a primitive data type in JavaScript?

A). String

B). Number

C). Object

D). Boolean

What is the output of '5' + 3?

A). 8

B). 53

C). 8

D). Error

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

A). function

B). object

C). undefined

D). number

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

A). array

B). object

C). number

D). list

What is the output of '5' - 3?

A). 2

B). 2

C). 53

D). Error