Concat/Push Object keys to Array

Question

I have the following problem to concat multiple object values into one Array!

My current code:

const coins = [];
Object.keys(prices).forEach((key) => {
    coins.push(prices[key]);
    console.log("prices", prices);
    console.log("prices[key]", prices[key]);
    console.log("coins", coins);
});

Output:

prices { ETH: { USD: 1332.03 }, BTC: { USD: 14602.09 } }
prices[key] { USD: 1332.03 }
coins [ { USD: 1332.03 } ]
prices { ETH: { USD: 1332.03 }, BTC: { USD: 14602.09 } }
prices[key] { USD: 14602.09 }
coins [ { USD: 1332.03 }, { USD: 14602.09 } ]

What needs to be achieved:

coins =  [ 1339.64, 14617.95 ]

I only need the values to do mathematical operations with them.

You're pushing the object in, change to coins.push(prices[key].USD); — StudioTime
– StudioTime, Commented Jan 10, 2018 at 16:42
Actually, why is your desired result different figures? coins = [ 1339.64, 14617.95 ] you start with 1332.03 & 14602.09 — StudioTime
– StudioTime, Commented Jan 10, 2018 at 16:46

Armen Vardanyan · Accepted Answer · 2018-01-10 16:44:47Z

3

Pushing the USD property would do:

coins.push(prices[key].USD);

But you can do it better:

Object.values(prices).map(price => price.USD);

answered Jan 10, 2018 at 16:44

Armen Vardanyan

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Comments

StudioTime · Accepted Answer · 2018-01-10 16:44:05Z

1

As stated in the comments, push the USD price in instead of the whole object:

const coins = [];
const prices = {
  ETH: {
    USD: 1332.03
  },
  BTC: {
    USD: 14602.09
  }
};
Object.keys(prices).forEach((key) => {
  coins.push(prices[key].USD); /* <- here is the change, add the key of the price */
  console.log("prices", prices);
  console.log("prices[key]", prices[key]);
  console.log("coins", coins);
});

answered Jan 10, 2018 at 16:44

StudioTime

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