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

A). typeof

B). instanceof

C). type

D). isType

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 is the type of the value returned by JSON.parse('null')?

A). null

B). string

C). object

D). undefined

What is the initial type of a variable declared with let a;?

A). null

B). number

C). undefined

D). object

How can you check if a variable is an array in JavaScript?

A). typeof variable === 'array'

B). Array.isArray(variable)

C). variable instanceof array

D). variable.constructor === array

In JavaScript, what will be the type of a variable x after x = 5 + true;?

A). number

B). string

C). boolean

D). undefined

What does the parseInt function do in JavaScript?

A). Converts a number to a string

B). Converts a string to an integer

C). Converts a boolean to a number

D). Converts an array to a number

What will typeof NaN return in JavaScript?

A). number

B). NaN

C). undefined

D). object

Which of the following values is considered falsy in JavaScript?

A). 1

B). 0

C). 0

D). {}

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