Q
What does NaN represent in JavaScript?

Answer & Solution

Answer: Option A
Solution:
NaN stands for 'Not a Number' and represents an invalid or unrepresentable value resulting from arithmetic operations.
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What is the outcome of typeof [1, 2, 3] in JavaScript?

A). String

B). Number

C). Array

D). Object

What is the data type of the value 'null' (with quotes) in JavaScript?

A). String

B). Number

C). Null

D). Undefined

What will let x = '10'; let y = x - 5; console.log(y); output in JavaScript?

A). '5'

B). 5

C). '10'

D). 10

Which operator checks if an object is an instance of a specific object type in JavaScript?

A). instanceof

B). typeof

C). isInstanceof

D). isTypeOf

What will be the result of typeof 'hello' in JavaScript?

A). String

B). Number

C). Undefined

D). Function

What is the data type of the value 42 in JavaScript?

A). String

B). Boolean

C). Number

D). Null

Which data type represents an intentional absence of any value in JavaScript?

A). Null

B). Undefined

C). String

D). Number

Which of these is a complex or reference data type in JavaScript?

A). Number

B). Boolean

C). Object

D). String

What will the following code snippet output: let a = 10; a += '5'; console.log(a); in JavaScript?

A). '105'

B). 105

C). 15

D). '15'

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

A). Array

B). Symbol

C). Map

D). Tuple