Answer & Solution
Answer: Option A
Solution:
Despite being considered a bug in JavaScript, the typeof null returns 'object'.
Q
What will let x = null; console.log(typeof x); output in JavaScript?
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Which data type represents positive infinity in JavaScript?
A). Infinity
B). Number
C). NaN
D). Null
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 does NaN represent in JavaScript?
A). Not a Number
B). Infinity
C). Positive Infinity
D). Negative Infinity
What is the result of 0 / 0 in JavaScript?
A). Infinity
B). 0
C). NaN
D). 1
What is the data type of the value undefined in JavaScript?
A). Number
B). Boolean
C). String
D). Undefined
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 'null' (with quotes) in JavaScript?
A). String
B). Number
C). Null
D). Undefined
What is the data type of the value 42 in JavaScript?
A). String
B). Boolean
C). Number
D). Null
Which of these is a complex or reference data type in JavaScript?
A). Number
B). Boolean
C). Object
D). String