React native json stringify return my array correctly but it cannot show specific object in array

Question

When I use {alert(JSON.stringify(cart[0]))} in my react-native app it shows me the whole array of object like this:

[{
  "id": 3,
  "name": John,
  .
  .
}]

but when I use {alert(JSON.stringify(cart[0].id))} for example it returns me undefined.

Paul Rumkin · Accepted Answer · 2020-07-13 22:08:40Z

1

The code you provided contains object with two nested arrays:

const cart = [
   [
     {
       id: 3,
       name: 'John',
       // ...
     }
   ],
]

When you try to receive value of cart[0].id you actually refer to id property of the second array. To extract the value you want use cart[0][0].id.

edited Jul 13, 2020 at 22:08

answered Jul 13, 2020 at 21:29

Paul Rumkin

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3 Comments

Pouyan Ahmadpour Over a year ago

thanks alot....but how can i refer this items inot FlatList data?? i used to use const { cart } = this.props

Paul Rumkin Over a year ago

According to the rules of StackOverflow you should to create new question and describe this exact problem (with FlatList) to let others answer your question. Thank you.

Paul Rumkin Over a year ago

Also, please mark correct answers as correct (if they are) using a checkmark. stackoverflow.com/help/accepted-answer

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