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 function can convert a number to a string in JavaScript?
A). toString()
B). parseInt()
C). String()
D). Number()
What is the data type of an array in JavaScript?
A). Array
B). Object
C). Collection
D). List
Which symbol is used to denote a string template literal?
A). ''
B).
C). ``
D). {}
What is the data type of 42 in JavaScript?
A). String
B). Boolean
C). Number
D). Object
What will typeof [1, 2, 3] return?
A). array
B). object
C). number
D). list
What is the result of typeof Symbol('id')?
A). symbol
B). object
C). string
D). undefined
What is the result of null === undefined?
A). 1
B). 0
C). Error
D). NaN
Which operator checks both value and type for equality in JavaScript?
A). ==
B). !=
C). ===
D). !==
Which of the following is not a primitive data type in JavaScript?
A). String
B). Number
C). Object
D). Boolean
What is the data type of true in JavaScript?
A). String
B). Boolean
C). Number
D). Object