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

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

A). '5'

B). 5

C). '10'

D). 10

Which of the following is a primitive data type in JavaScript?

A). Object

B). Array

C). Function

D). Boolean

Which data type represents unique and immutable values in JavaScript introduced in ES6?

A). Symbol

B). Object

C). Array

D). Function

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 undefined in JavaScript?

A). Number

B). Boolean

C). String

D). Undefined

What does NaN represent in JavaScript?

A). Not a Number

B). Infinity

C). Positive Infinity

D). Negative Infinity

What will let x = null; console.log(typeof x); output in JavaScript?

A). Object

B). Null

C). Undefined

D). Number

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

A). Number

B). Boolean

C). Object

D). String

Which data type represents positive infinity in JavaScript?

A). Infinity

B). Number

C). NaN

D). Null

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

A). Null

B). Undefined

C). String

D). Number