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 of the following is a falsy value in JavaScript?
A). 0
B).
C). null
D). All of the above
What will typeof [1, 2, 3] return?
A). array
B). object
C). number
D). list
Which symbol is used to denote a string template literal?
A). ''
B).
C). ``
D). {}
What is the output of typeof null?
A). null
B). undefined
C). object
D). number
Which operator checks both value and type for equality in JavaScript?
A). ==
B). !=
C). ===
D). !==
What is the data type of 42 in JavaScript?
A). String
B). Boolean
C). Number
D). Object
What is the output of typeof function() {}?
A). function
B). object
C). undefined
D). number
What will typeof NaN return?
A). number
B). NaN
C). undefined
D). object
Which method can be used to convert a string to a number in JavaScript?
A). parseInt()
B). toString()
C). toNumber()
D). parseStr()
What is the result of null == undefined?
A). 1
B). 0
C). Error
D). NaN