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
Which method can be used to convert a string to a number in JavaScript?
A). parseInt()
B). toString()
C). toNumber()
D). parseStr()
Which operator checks both value and type for equality in JavaScript?
A). ==
B). !=
C). ===
D). !==
What is the data type of an array in JavaScript?
A). Array
B). Object
C). Collection
D). List
Which function can convert a number to a string in JavaScript?
A). toString()
B). parseInt()
C). String()
D). Number()
What is the output of typeof function() {}?
A). function
B). object
C). undefined
D). number
What will typeof [1, 2, 3] return?
A). array
B). object
C). number
D). list
What is the output of typeof null?
A). null
B). undefined
C). object
D). number
Which of the following is a falsy value in JavaScript?
A). 0
B).
C). null
D). All of the above
What is the output of '5' + 3?
A). 8
B). 53
C). 8
D). Error
What is the result of typeof undefined?
A). undefined
B). null
C). object
D). number