Answer & Solution
Answer: Option A
Solution:
The instanceof operator checks if an object is an instance of a specific object type in JavaScript.
Q
Which operator checks if an object is an instance of a specific object type in JavaScript?
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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
What is the data type of the value true in JavaScript?
A). Number
B). String
C). Boolean
D). Undefined
What is the outcome of typeof [1, 2, 3] in JavaScript?
A). String
B). Number
C). Array
D). Object
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
What is the data type of the value 'null' (with quotes) in JavaScript?
A). String
B). Number
C). Null
D). Undefined
Which data type represents a block of reusable code in JavaScript?
A). String
B). Object
C). Function
D). Number
Which of the following is not a valid data type in JavaScript?
A). Array
B). Symbol
C). Map
D). Tuple
Which of these is a complex or reference data type in JavaScript?
A). Number
B). Boolean
C). Object
D). String