Answer & Solution
Answer: Option B
Solution:
The Number function converts the string '123' to the number 123, changing the type of z to number.
Q
What will be the result of the following code: let z = '123'; z = Number(z); console.log(typeof z);?
Related Questions on Average
What will typeof null return in JavaScript?
A). null
B). undefined
C). object
D). number
Given let a = '10'; let b = 20;, what is the result of a + b?
A). 30
B). 1020
C). 30
D). NaN
Which of the following values is considered falsy in JavaScript?
A). 1
B). 0
C). 0
D). {}
Which operator is used to determine the type of a variable in JavaScript?
A). typeof
B). instanceof
C). type
D). isType
Given the code: let y = 10; y = true;, what is the type of y after execution?
A). number
B). boolean
C). string
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
In JavaScript, what will be the type of a variable x after x = 5 + true;?
A). number
B). string
C). boolean
D). undefined
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
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