What is the outcome of typeof undefined in JavaScript?
A). String
B). Undefined
C). Null
D). Number
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 of the following is not a valid data type in JavaScript?
A). Array
B). Symbol
C). Map
D). Tuple
What does NaN represent in JavaScript?
A). Not a Number
B). Infinity
C). Positive Infinity
D). Negative Infinity
What is the data type of the value true in JavaScript?
A). Number
B). String
C). Boolean
D). Undefined
What is the data type of the value undefined in JavaScript?
A). Number
B). Boolean
C). String
D). Undefined
What is the result of 0 / 0 in JavaScript?
A). Infinity
B). 0
C). NaN
D). 1
Which operator checks if an object is an instance of a specific object type in JavaScript?
A). instanceof
B). typeof
C). isInstanceof
D). isTypeOf
Which of these is a complex or reference data type in JavaScript?
A). Number
B). Boolean
C). Object
D). String