Answer & Solution
Answer: Option A
Solution:
The typeof operator returns a string indicating the type of the unevaluated operand.
Q
Which operator is used to determine the type of a variable in JavaScript?
Related Questions on Average
What does the isNaN function do?
A). Checks if a value is not a number
B). Converts a value to a number
C). Checks if a value is a number
D). Converts a value to NaN
What will be the result of the following code: let z = '123'; z = Number(z); console.log(typeof z);?
A). string
B). number
C). undefined
D). boolean
What does it mean that JavaScript is dynamically typed?
A). Variables do not have types
B). Variables can change type
C). Variables must be declared with a type
D). Variables cannot change type
What is the result of typeof [] in JavaScript?
A). array
B). object
C). list
D). undefined
What will be the result of typeof function() {} in JavaScript?
A). function
B). object
C). undefined
D). method
Which of the following values is considered falsy in JavaScript?
A). 1
B). 0
C). 0
D). {}
Given let a = '10'; let b = 20;, what is the result of a + b?
A). 30
B). 1020
C). 30
D). NaN
What is the initial type of a variable declared with let a;?
A). null
B). number
C). undefined
D). object
What will typeof NaN return in JavaScript?
A). number
B). NaN
C). undefined
D). object
Which type conversion happens automatically in the expression 3 + '5'?
A). Number to String
B). String to Number
C). Boolean to String
D). Number to Boolean