Answer & Solution
Answer: Option A
Solution:
The typeof operator returns 'number' for NaN (Not-a-Number) values.
Q
What will typeof NaN return?
Related Questions on Average
What will typeof [1, 2, 3] return?
A). array
B). object
C). number
D). list
What is the output of typeof function() {}?
A). function
B). object
C). undefined
D). number
How do you declare a variable with an undefined value?
A). let x;
B). let x = '';
C). let x = 0;
D). let x = null;
Which of the following is a falsy value in JavaScript?
A). 0
B).
C). null
D). All of the above
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 output of typeof null?
A). null
B). undefined
C). object
D). number
What is the output of '5' - 3?
A). 2
B). 2
C). 53
D). Error
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()