Q
What happens when you add a number and a string in JavaScript?

Answer & Solution

Answer: Option B
Solution:
When a number is added to a string, the number is converted to a string and concatenated.
Related Questions on Average

Which of the following values is considered falsy in JavaScript?

A). 1

B). 0

C). 0

D). {}

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

What will typeof null return in JavaScript?

A). null

B). undefined

C). object

D). number

What is the type of the value returned by parseFloat('3.14abc')?

A). number

B). string

C). NaN

D). undefined

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 operator is used to determine the type of a variable in JavaScript?

A). typeof

B). instanceof

C). type

D). isType

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

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 initial type of a variable declared with let a;?

A). null

B). number

C). undefined

D). object