Answer & Solution
Answer: Option A
Solution:
Declaring a variable without assigning a value to it initializes it with undefined.
Q
How do you declare a variable with an undefined value?
Related Questions on Average
What is the result of typeof undefined?
A). undefined
B). null
C). object
D). number
Which operator checks both value and type for equality in JavaScript?
A). ==
B). !=
C). ===
D). !==
What is the output of typeof null?
A). null
B). undefined
C). object
D). number
What is the data type of an array in JavaScript?
A). Array
B). Object
C). Collection
D). List
What will typeof [1, 2, 3] return?
A). array
B). object
C). number
D). list
What is the data type of 42 in JavaScript?
A). String
B). Boolean
C). Number
D). Object
What is the result of null === undefined?
A). 1
B). 0
C). Error
D). NaN
What is the output of '5' - 3?
A). 2
B). 2
C). 53
D). Error
What will typeof NaN return?
A). number
B). NaN
C). undefined
D). object
What is the output of typeof function() {}?
A). function
B). object
C). undefined
D). number