Question 286017 in Javascript Question posted in
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Javascript – Create nested object from list of objects

Is it possible to parse through this list and create a new nested object for every sensor after "RECORD".

{
    "TIMESTAMP": "2022-10-21 13:55:00",
    "RECORD": "0",
    "Sensor1": "1.654",
    "Sensor2": "1.176",
    "Sensor3": "0.706"
}

Result:

{
    "Sensor1": {
        "TIMESTAMP": "2022-08-21 13:55:00",
        "Value": "1.654"
    },
    "Sensor2": {
        "TIMESTAMP": "2022-08-21 13:55:00",
        "Value": "1.176"
    },
    "Sensor3": {
        "TIMESTAMP": "2022-08-21 13:55:00",
        "Value": "0.706"
    }
}
Tags:

3

Answers


  1. 0

    Just loop through the object keys, ignore the TIMESTAMP and RECORD keys, and each other key just create its according object with the required values:

    const transform = (input) => {
  return Object.keys(input).reduce((accum, inputKey) => {
    if (inputKey === 'TIMESTAMP' || inputKey === 'RECORD') {
      return accum;
    }

    return {
      ...accum,
      [inputKey]: {
        TIMESTAMP: input.TIMESTAMP,
        Value: input[inputKey]
      } 
    };
  }, {})
}

// Example
const exampleObject = {
  "TIMESTAMP": "2022-10-21 13:55:00",
  "RECORD": "0",
  "Sensor1": "1.654",
  "Sensor2": "1.176",
  "Sensor3": "0.706"
};

console.log(transform(exampleObject));
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  2. 0

    You can try reducing it with Object.entries(...).reduce(...);. Example below:

    const input = {
    "TIMESTAMP": "2022-10-21 13:55:00",
    "RECORD": "0",
    "Sensor1": "1.654",
    "Sensor2": "1.176",
    "Sensor3": "0.706"
};

const result = Object.entries(input).reduce((res, [key, val]) => {
  if (!key.startsWith("Sensor")) return res;
  
  res[key] = {
    TIMESTAMP: input.TIMESTAMP,
    Value: val
  };
  
  return res;
}, {});

console.log(result);
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  3. 0

    Use destructuring to get TIMESTAMP from the original object.

    Use Object.entries to get [key, value] pairs from the data. Then, use filter to keep only entries whose key starts with ‘Sensor’.

    Finally, map each sensor value to a new object that includes TIMESTAMP from the original object.

    let data = { "TIMESTAMP": "2022-10-21 13:55:00", "RECORD": "0", "Sensor1": "1.654", "Sensor2": "1.176", "Sensor3": "0.706" }

let {TIMESTAMP} = data

let result = Object.entries(data)
  .filter(([k]) => k.startsWith('Sensor'))
  .map(([,Value]) => ({ TIMESTAMP, Value }))

console.log(result)
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