Ways to extract data from an array containing nested objects

Question

Ways to extract data from an array containing nested objects

I have received data from an external source:

[{
  "mode": "CURR",
  "isin": "PLESLTN00010",
  "from": 451183,
  "to": null,
  "data": [{
    "t": 1624265539,
    "p": 5,
    "o": 5,
    "c": 5,
    "l": 5,
    "h": 5,
    "v": 2
  }]
}]

My goal is to extract the value of "c" within the data array.

This is what I attempted:

const arrNcnct = ncdata.map(a => a.data).flat();

Although it retrieves the entire data object, I'm struggling to specifically get the value of "c".

const c = arrNcnct.map(el => ({ current: el.c}));
console.log(Object.values(c));

The output shows:

[{"current": 5}]

Seems like I am missing something...

javascript arrays object

Answer 1

Answer №1

Here are the steps you can take:

let result = [{
  "mode":"CURR", "isin":"PLESLTN00010", "from":451183, "to":null,
  "data":[{"t":1624265539, "p":5, "o":5, "c":5, "l":5, "h":5, "v":2}]
}];
        
let nestedResult = result[0].data;

nestedResult is an array. If there is only one item in the array, you can access it by using nestedResult[0], but if there are multiple items, then a loop is needed.

To access the "c" property, use nestedResult[0].c

Answer 2

Here are the steps you can take:

let result = [{
  "mode":"CURR", "isin":"PLESLTN00010", "from":451183, "to":null,
  "data":[{"t":1624265539, "p":5, "o":5, "c":5, "l":5, "h":5, "v":2}]
}];
        
let nestedResult = result[0].data;

nestedResult is an array. If there is only one item in the array, you can access it by using nestedResult[0], but if there are multiple items, then a loop is needed.

To access the "c" property, use nestedResult[0].c

Ways to extract data from an array containing nested objects

Answer №1

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