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

What is the outcome of typeof [1, 2, 3] in JavaScript?

A). String

B). Number

C). Array

D). Object

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

A). Array

B). Symbol

C). Map

D). Tuple

Which data type represents positive infinity in JavaScript?

A). Infinity

B). Number

C). NaN

D). Null

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

A). String

B). Number

C). Undefined

D). Function

What does NaN represent in JavaScript?

A). Not a Number

B). Infinity

C). Positive Infinity

D). Negative Infinity

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 these is a complex or reference data type in JavaScript?

A). Number

B). Boolean

C). Object

D). String

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

A). '5'

B). 5

C). '10'

D). 10

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

A). String

B). Number

C). Null

D). Undefined

What is the outcome of typeof undefined in JavaScript?

A). String

B). Undefined

C). Null

D). Number