How can you check if a variable is an array in JavaScript?

Which operator is used to determine the type of a variable in JavaScript?

A). typeof

B). instanceof

C). type

D). isType

What will typeof null return in JavaScript?

A). null

B). undefined

C). object

D). number

Given let a = '10'; let b = 20;, what is the result of a + b?

A). 30

B). 1020

C). 30

D). NaN

What does the parseInt function do in JavaScript?

A). Converts a number to a string

B). Converts a string to an integer

C). Converts a boolean to a number

D). Converts an array to a number

What will be the result of typeof function() {} in JavaScript?

A). function

B). object

C). undefined

D). method

What is the result of the following code: let x = 5; x = 'hello'; console.log(typeof x);?

A). number

B). string

C). undefined

D). object

Given the code: let y = 10; y = true;, what is the type of y after execution?

A). number

B). boolean

C). string

D). object

What does the isNaN function do?

A). Checks if a value is not a number

B). Converts a value to a number

C). Checks if a value is a number

D). Converts a value to NaN

Which of the following values is considered falsy in JavaScript?

A). 1

B). 0

C). 0

D). {}

What will typeof NaN return in JavaScript?

A). number

B). NaN

C). undefined

D). object