Answer & Solution
Answer: Option B
Solution:
When a number is added to a string, the number is converted to a string and concatenated.
Q
What happens when you add a number and a string in JavaScript?
Related Questions on Average
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 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
Which of the following values is considered falsy in JavaScript?
A). 1
B). 0
C). 0
D). {}
What is the type of the value returned by parseFloat('3.14abc')?
A). number
B). string
C). NaN
D). undefined
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
Given let a = '10'; let b = 20;, what is the result of a + b?
A). 30
B). 1020
C). 30
D). 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 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