React Map Function MCQ Map Practice Questions

Direction: Choose the correct option

What does the map() function return when used on an array?

A. A new array of the same length

B. A boolean

C. The original array

D. A string

Direction: Choose the correct option

In React, what do you typically return inside a map callback?

A. A string

B. An object

C. A number

D. A React element (JSX)

Direction: Choose the correct option

Given const numbers = [1,2,3]; What does numbers.map(n =>

{n}

) produce?

A. A string

B. An error

C. An array of li elements

D. A single li

Direction: Choose the correct option

Where should you place the key prop when using map?

A. On each child inside the map

B. On the outermost element returned by map

C. On the map function

D. On the parent container

Direction: Choose the correct option

What happens if you forget to return something in a map callback?

A. An error is thrown

B. The array contains null

C. The map doesn't run

D. The array contains undefined

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