React Native AsyncStorage: Push to an array with a key

Question

Hi I am having trouble with adding values to an array inside AsyncStorage.

AsyncStorage.getItem('savedIds', (err, result) => {
  const id = '1';
  if (result !== null) {
      console.log('Data Found', result);
      result = JSON.parse(result);
      result.push(id);
      AsyncStorage.setItem('savedIds', JSON.stringify(result));
    } else {
      console.log('Data Not Found');
      AsyncStorage.setItem('savedIds', id);
    }
});

AsyncStorage.getItem('savedIds', (err, result) => {
  console.log(result);
});

After my the initial id is set I get the error "result.push" is not a function. What do I need to change to fix this? or is there a more elegant solution to this?

typeof result not be an array. So it throws error "result.push" is not a function — Tamil Selvan C
– Tamil Selvan C, Commented Mar 8, 2017 at 13:32
It's undefined, How do I setup the first id to be apart of an array so I can push data into it. — Carl Wirkus
– Carl Wirkus, Commented Mar 8, 2017 at 14:07

vinayr · Accepted Answer · 2017-03-08 14:29:21Z

13

AsyncStorage.getItem('savedIds', (err, result) => {
  const id = [1];
  if (result !== null) {
    console.log('Data Found', result);
    var newIds = JSON.parse(result).concat(id);
    AsyncStorage.setItem('savedIds', JSON.stringify(newIds));
  } else {
    console.log('Data Not Found');
    AsyncStorage.setItem('savedIds', JSON.stringify(id));
  }
});

answered Mar 8, 2017 at 14:29

vinayr

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