Undefined error getting in javascript (React Native)

Question

I am storing particular key value in Database. But, While fetching the key value, getting undefined error.

await DbHandler.fetch(codeStatus)
  .then((result) => {
    const codeEnabledObj = result[0];
    console.log('codeEnabledObj', codeEnabledObj);
    let codeEnabled = false;
    if (codeEnabledObj && codeEnabledObj.length > 0) { // this code not executing at all.
      codeEnabled = codeEnabledObj[0].isEnabled;
    }
    console.log('codeEnabled', codeEnabled); // getting false always
    console.log('codeEnabledObj.length[0]', codeEnabledObj.length); // undefined

  })
  .catch((error) => {

  });

The issue is, It's not going inside if condition and throwing error like undefined.

But, If we print the response from db fetch

'codeEnabledObj', { type: 'codeStatus', isEnabled: true } // This is my response

Any suggestions?

where is this log in code? 'codeEnabledObj.length[0]', undefined — Jaydeep Galani
– Jaydeep Galani, Commented Apr 17, 2019 at 10:13
firstly, what's the codeEnabledObj.length[0]? I guess that's typo. and are you sure your response is an array? codeEnabledObj Is looks like an object from your answer. — akcoban
– akcoban, Commented Apr 17, 2019 at 10:14

Jaydeep Galani · Accepted Answer · 2019-04-17 10:33:17Z

2

Objects don't have length property like an array.

codeEnabledObj.length is wrong

use this,

 Object.keys(codeEnabledObj).length

EDIT :

codeEnabledObj[0].isEnabled should be only codeEnabledObj.isEnabled

edited Apr 17, 2019 at 10:33

answered Apr 17, 2019 at 10:17

Jaydeep Galani

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1 Comment

Anilkumar iOS Developer Over a year ago

But, If I tried to get codeEnabledObj values, still I am not able to get.

Murtaza Hussain · Accepted Answer · 2019-04-17 10:40:02Z

0

There is no property length in the codeEnabledObj , Moreover its not an Array.. so modifying the condition would work, where isEmpty could be a function used from node package as underscore

if (isEmpty(codeEnabledObj)) { // ... }

and

codeEnabledObj.isEnabled

Thanks.

answered Apr 17, 2019 at 10:40

Murtaza Hussain

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