Get data from array with several object

Question

i would like to get the "-lists" data from an array with several objects:

[{...},{...},{...},{"-name": "Test", "-lists": [123, 456, 789]},{...}]

i tried with a filter function but it doesnt works :-(

this is the query where i would like to change the result to the value/array of "-lists"

             .findOne({ _id: serviceID }, function (err, result) {
                if (err) {
                    res.json(err);
                } else {
                    try{
                        res.json(result.service.modules)
                        console.log(result.service.modules)
                    }catch(error){
                        console.log(error)
                    }
                        
                }
            })

Have someone an idea for me?

Best regrads & stay healthy

famoha · Accepted Answer · 2021-04-08 09:03:29Z

1

This is an example of one of the approaches you can use to extract the value of an array nested in an object which is inside an array.

const arr = [{ someValue: 1 }, { "-lists": [1, 2, 3] }];
const result = [];

arr.filter((val) => {
  if (val["-lists"]) {
    result.push(...val["-lists"]);
  }
});

console.log(result);

answered Apr 8, 2021 at 9:03

famoha

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1 Comment

famoha Over a year ago

no problem! make sure to mark this as an answer so it will help other people who have the same problem :)

Krantisinh · Accepted Answer · 2021-04-08 08:59:23Z

1

You can try the map function of the array.

const data = [
  {"-name": "Test", "-lists": [123, 456, 789]},
  {"-name": "Test", "-lists": [222, 333, 444]}
 ];
 
 const result = data.map((x) => x['-lists']);
 
 console.log(result);

This will return an array of the lists data which is an array in itself.

answered Apr 8, 2021 at 8:59

Krantisinh

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