Question 217720 in Javascript Question posted in
A very good W3school tutorial can be found here.

Javascript – Cannot read properties of undefined error, when trying to access depths in a data set

code

if (interaction.commandName === 'comp-scrambles') {

        let datascrams = {};
        
        fs.readFile('scrambles.json', 'utf8', function(err, rawData){
            let datascrams = rawData;
        })
        const replyscrams = datascrams[interaction.options.getString('cube')]['scrams'];

        interaction.reply(replyscrams);
 
    }

JSON:

{
  "3x3": [
    {
      "scrams": "das"
    }
  ]
}

I expect it to go to my JSON file and go in the cube depth, and then the scrambles and take that. But it says

C:UsersLogan AltOneDriveDesktopKinchServer Comp Botsrcindex.js:479
        const replyscrams = datascrams[interaction.options.getString('cube')]['scrams'];
                                                                             ^

TypeError: Cannot read properties of undefined (reading 'scrams')
    at Client.<anonymous> (C:UsersLogan AltOneDriveDesktopKinchServer Comp
``` which is the error message
Tags:

2

Answers


  1. 0

    The json you used as an example has "scrams" inside an array,

    {
  "3x3": [ //here
    {
      "scrams": "das"
    }
  ]
}

    that would make your variable be:

    const replyscrams = datascrams[interaction.options.getString('cube')][0]['scrams'];

    added [0], or any index you need, after datascrams[interaction.options.getString('cube')] and before ['scrams']

    Login or Signup to reply.
  2. 0

    You could improve your code this way:

    Code

    if ( interaction.commandName === 'comp-scrambles' ) {
    // Read File Sync
    const datascrams = fs.readFileSync( 'scrambles.json', { encoding: 'utf8' } ) || {};

    // Get Cube Variable
    const interactionCube = interaction?.options?.getString('cube') || null;

    // Chain ands to determine if structure exits
    const replyscrams = datascrams && datascrams[ interactionCube ] && datascrams[ interactionCube ][0] && datascrams[ interactionCube ][0].scrams || null;

    // Send reply
    interaction.reply( replyscrams );
}
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search