Which data type represents positive infinity in JavaScript?
A). Infinity
B). Number
C). NaN
D). Null
Which data type represents a block of reusable code in JavaScript?
A). String
B). Object
C). Function
D). Number
Which data type represents unique and immutable values in JavaScript introduced in ES6?
A). Symbol
B). Object
C). Array
D). Function
Which of the following is a primitive data type in JavaScript?
A). Object
B). Array
C). Function
D). Boolean
What does NaN represent in JavaScript?
A). Not a Number
B). Infinity
C). Positive Infinity
D). Negative Infinity
What is the outcome of typeof [1, 2, 3] in JavaScript?
A). String
B). Number
C). Array
D). Object
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 data type represents an intentional absence of any value in JavaScript?
A). Null
B). Undefined
C). String
D). Number
Which of the following is not a valid data type in JavaScript?
A). Array
B). Symbol
C). Map
D). Tuple