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
Which operator is used to determine the type of a variable in JavaScript?
A). typeof
B). instanceof
C). type
D). isType
What is the initial type of a variable declared with let a;?
A). null
B). number
C). undefined
D). object
What will typeof null return in JavaScript?
A). null
B). undefined
C). object
D). number
What will be the result of typeof function() {} in JavaScript?
A). function
B). object
C). undefined
D). method
In JavaScript, what will be the type of a variable x after x = 5 + true;?
A). number
B). string
C). boolean
D). undefined
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 type of the value returned by parseFloat('3.14abc')?
A). number
B). string
C). NaN
D). undefined
Which of the following values is considered falsy in JavaScript?
A). 1
B). 0
C). 0
D). {}
What is the result of typeof [] in JavaScript?
A). array
B). object
C). list
D). undefined