CODEWITHSUNDEEP
javascriptreactjs
Paliao
Paliao

Reputation: 69

ReactJS - Array Callback Return

In this case, I'm making a sum of the object and its working just as I wanted to, the problem is the following message:

Expected to return a value in arrow function array-callback-return

Here is the code:

data.map((current,index, array) => {
    const prevVisitors = array[index - 1 ] ? array[index - 1].visitors : 0
    current.visitors += prevVisitors
})

What should I use as a return statement if there is nothing to be returned(Since it's only a modification of the props)? And in what cases this error is useful?

Upvotes: 0

Views: 1217

Answers (1)

Laura delgado
Laura delgado

Reputation: 362

Your code should be 

data.map((current,index, array) => {
    const prevVisitors = array[index - 1 ] ? array[index - 1].visitors : 0
    return current.visitors += prevVisitors
})

Upvotes: 1

Related Questions