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 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 will be the result of typeof function() {} in JavaScript?
A). function
B). object
C). undefined
D). method
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
Given the code: let y = 10; y = true;, what is the type of y after execution?
A). number
B). boolean
C). string
D). object
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
Given let a = '10'; let b = 20;, what is the result of a + b?
A). 30
B). 1020
C). 30
D). NaN
What happens when you add a number and a string in JavaScript?
A). An error is thrown
B). The number is converted to a string
C). The string is converted to a number
D). Both are converted to boolean
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
What is the result of typeof [] in JavaScript?
A). array
B). object
C). list
D). undefined