Which of the following is not a valid data type in JavaScript?
A). Array
B). Symbol
C). Map
D). Tuple
What is the data type of the value 42 in JavaScript?
A). String
B). Boolean
C). Number
D). Null
What is the result of 0 / 0 in JavaScript?
A). Infinity
B). 0
C). NaN
D). 1
Which data type represents positive infinity in JavaScript?
A). Infinity
B). Number
C). NaN
D). Null
What will let x = null; console.log(typeof x); output in JavaScript?
A). Object
B). Null
C). Undefined
D). Number
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 will let x = '10'; let y = x - 5; console.log(y); output in JavaScript?
A). '5'
B). 5
C). '10'
D). 10
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 a primitive data type in JavaScript?
A). Object
B). Array
C). Function
D). Boolean