将嵌套对象数组转换为对象数组的最佳方法

Question

 const data = [ { 'UTMEH5': { descr: { ordertype: 'limit', pair: 'XBT/USD', price: '5000.00000', }, status: 'open', vol: '0.00200000', }, }, { '3F2TYE': { descr: { ordertype: 'limit', pair: 'XBT/USD', price: '10000.00000' }, status: 'open', vol: '0.00200000', }, }, ] const orders = data.map((order) => { return Object.entries(order).map(([key, value]) => ({ orderid: key, pair: value['descr']['pair'], vol: value['vol'], price: value['descr']['price'], ordertype: value['descr']['ordertype'], status: value['status'], }))}) console.log(orders)

With the above code I am getting this:

[
  [
    {
      "orderid": "UTMEH5",
      "pair": "XBT/USD",
      "vol": "0.00200000",
      "price": "5000.00000",
      "ordertype": "limit",
      "status": "open"
    }
  ],
  [
    {
      "orderid": "3F2TYE",
      "pair": "XBT/USD",
      "vol": "0.00200000",
      "price": "10000.00000",
      "ordertype": "limit",
      "status": "open"
    }
  ]
]

but I want this:

[
    {
      "orderid": "UTMEH5",
      "pair": "XBT/USD",
      "vol": "0.00200000",
      "price": "5000.00000",
      "ordertype": "limit",
      "status": "open"
    },
    {
      "orderid": "3F2TYE",
      "pair": "XBT/USD",
      "vol": "0.00200000",
      "price": "10000.00000",
      "ordertype": "limit",
      "status": "open"
    }
]

With the duplicate suggestion it looks like I can use .flat() , but that seems like a roundabout way to get what I'm looking for. Is there a better more straightforward way?

Answer 1

You can use flatMap() instead of map() for such case.

 const data = [{ 'UTMEH5': { descr: { ordertype: 'limit', pair: 'XBT/USD', price: '5000.00000', }, status: 'open', vol: '0.00200000', }, }, { '3F2TYE': { descr: { ordertype: 'limit', pair: 'XBT/USD', price: '10000.00000' }, status: 'open', vol: '0.00200000', }, }, ] const orders = data.flatMap((order) => Object.entries(order).map(([key, value]) => ({ orderid: key, vol: value['vol'], status: value['status'], ...value['descr'], // you can use spread operator here for brevity as well }))) console.log(orders)