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 not a primitive data type in JavaScript?
A). String
B). Number
C). Object
D). Boolean
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 typeof undefined?
A). undefined
B). null
C). object
D). number
What is the result of null === undefined?
A). 1
B). 0
C). Error
D). NaN
What is the result of null == undefined?
A). 1
B). 0
C). Error
D). NaN
Which function can convert a number to a string in JavaScript?
A). toString()
B). parseInt()
C). String()
D). Number()
What is the output of '5' + 3?
A). 8
B). 53
C). 8
D). Error
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 is the result of typeof Symbol('id')?
A). symbol
B). object
C). string
D). undefined