Q
What is the result of typeof undefined in JavaScript?

Answer & Solution

Answer: Option B
Solution:
typeof undefined returns 'undefined'.
Related Questions on Average

How does JavaScript evaluate typeof /^regex$/ in JavaScript?

A). regexp

B). object

C). string

D). null

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

A). function

B). object

C). undefined

D). null

What will be the output of typeof {} in JavaScript?

A). object

B). array

C). null

D). undefined

What will be the output of [] instanceof Array in JavaScript?

A). 1

B). 0

C). null

D). undefined

How does JavaScript evaluate typeof 'Hello'?

A). string

B). object

C). undefined

D). null

What does the typeof operator return for an undefined variable?

A). undefined

B). number

C). boolean

D). string

What is the result of typeof NaN in JavaScript?

A). number

B). NaN

C). undefined

D). string

How does the instanceof operator work in JavaScript?

A). Checks if an object has a specific prototype in its prototype chain.

B). Checks if two variables are of the same type.

C). Checks if a variable is null.

D). Checks if a variable is undefined.

What does Number('123') return in JavaScript?

A). 123

B). '123'

C). NaN

D). 1

What does typeof true evaluate to in JavaScript?

A). boolean

B). number

C). string

D). undefined