Get value in promise array

Question

I'm using AsyncStorage from react-native to get and store data for my app. I successfully store data via AsyncStorage but when I try to getItem from AsyncStorage it

Promise {_40: 0, _65: 1, _55: "30", _72: null}

How to get "30" value? I tried .json and Promise.resolved to get the data, both not working.

react-native: "0.47.1"
android version: 6

Use Promise.all(), refer to https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise — vibhor1997a, Dec 10 '17 at 07:20

score 4 · Answer 1 · answered Dec 10 '17 at 07:26

if you want to get value from it you must do this :

you have 2 ways :

1.using async/await as code below :

async function(){
  var a = await someFunction(your_input);
  console.log(a)
}

2.using .then()

someFuntion(your_input).then((result)=>{
  console.log(result)
})

score 2 · Answer 2 · answered Mar 29 '19 at 14:14

2

this is solution:

    var data=''
    Promise.resolve(your_promise).then(value=>{
    console.log('value:',value)
    data=value;
    })

answered Mar 29 '19 at 14:14

Sumit Thakur

21
2

try to add more description of the solution. – Paras Korat Mar 29 '19 at 14:18

score 0 · Answer 3 · answered Dec 10 '17 at 08:19

0

You can use:

var myPromise = Promise.resolve({_40: 0, _65: 1, _55: "30", _72: null});
myPromise.then(
  value=>{
    console.log("get value._55",value._55);
  }
)

More on why promises are used and some info on how to use them can be found here.

answered Dec 10 '17 at 08:19

HMR

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Get value in promise array

3 Answers3