How to use map function to return multiple keys from an array of objects? ES6

Question

If I have an array of objects

var bitcoinData = [
{
  "date": "2013-05-01",
  "txVolume(USD)": 108659660.293,
  "txCount": 52443,
  "marketcap(USD)": 1542820000,
  "price(USD)": 139,
  "exchangeVolume(USD)": 0,
  "generatedCoins": 3575,
  "fees": 36.80599998,
  "activeAddresses": null
},
{
  "date": "2013-05-02",
  "txVolume(USD)": 96958519.0041,
  "txCount": 55169,
  "marketcap(USD)": 1292190000,
  "price(USD)": 116.38,
  "exchangeVolume(USD)": 0,
  "generatedCoins": 3425,
  "fees": 54.40791613,
  "activeAddresses": null

How can I create an array containing only the date and price of each day by using the map function?

Bibberty · Accepted Answer · 2019-12-03 23:28:42Z

The naming "price(USD)" causes a problem for destructuring. So used basic instead. Here you go.

const bitcoinData = [
{
  "date": "2013-05-01",
  "txVolume(USD)": 108659660.293,
  "txCount": 52443,
  "marketcap(USD)": 1542820000,
  "price(USD)": 139,
  "exchangeVolume(USD)": 0,
  "generatedCoins": 3575,
  "fees": 36.80599998,
  "activeAddresses": null
},
{
  "date": "2013-05-02",
  "txVolume(USD)": 96958519.0041,
  "txCount": 55169,
  "marketcap(USD)": 1292190000,
  "price(USD)": 116.38,
  "exchangeVolume(USD)": 0,
  "generatedCoins": 3425,
  "fees": 54.40791613,
  "activeAddresses": null
  }];
  
  const summary = bitcoinData.map(item => ({ date: item.date, price: item["price(USD)"] }));
  
  console.log(summary);

Solved the destructuring issue, here it is using that technique.

    const bitcoinData = [
    {
      "date": "2013-05-01",
      "txVolume(USD)": 108659660.293,
      "txCount": 52443,
      "marketcap(USD)": 1542820000,
      "price(USD)": 139,
      "exchangeVolume(USD)": 0,
      "generatedCoins": 3575,
      "fees": 36.80599998,
      "activeAddresses": null
    },
    {
      "date": "2013-05-02",
      "txVolume(USD)": 96958519.0041,
      "txCount": 55169,
      "marketcap(USD)": 1292190000,
      "price(USD)": 116.38,
      "exchangeVolume(USD)": 0,
      "generatedCoins": 3425,
      "fees": 54.40791613,
      "activeAddresses": null
      }];
      
      const summary = bitcoinData.map(({ date, "price(USD)": price }) => ({ date, price }));
      
      console.log(summary);

Renaldo Balaj · Accepted Answer · 2019-12-03 23:22:40Z

0

Done

var bitcoinData = [
{
  "date": "2013-05-01",
  "txVolume(USD)": 108659660.293,
  "txCount": 52443,
  "marketcap(USD)": 1542820000,
  "price(USD)": 139,
  "exchangeVolume(USD)": 0,
  "generatedCoins": 3575,
  "fees": 36.80599998,
  "activeAddresses": null
},
{
  "date": "2013-05-02",
  "txVolume(USD)": 96958519.0041,
  "txCount": 55169,
  "marketcap(USD)": 1292190000,
  "price(USD)": 116.38,
  "exchangeVolume(USD)": 0,
  "generatedCoins": 3425,
  "fees": 54.40791613,
  "activeAddresses": null
 }]
 
 console.log(bitcoinData.map(data=> {
 return {
   date: data.date,
   'price(USD)': data['price(USD)']
 }})
 )

answered Dec 3, 2019 at 23:22

Renaldo Balaj

2,45014 silver badges24 bronze badges

Comments

Mauro López · Accepted Answer · 2019-12-03 23:30:45Z

0

Try this:

bitcoinData.map(element => {
    return ({"date":element.date, "price(USD)":element["price(USD)"]})
});

answered Dec 3, 2019 at 23:30

Mauro López

1094 bronze badges

Comments

Kobe · Accepted Answer · 2019-12-04 09:14:04Z

-2

BitCoinData.map(bitCoin => {date: bitcoin.date, price: bitcoin.price});

This should return an array of objects containing only the date and price

edited Dec 4, 2019 at 9:14

Kobe

6,4681 gold badge18 silver badges38 bronze badges

answered Dec 3, 2019 at 23:23

oknad

354 bronze badges

1 Comment

Kobe Over a year ago

This code won't even run. You should wrap the curly braces with some parenthesis.

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