javascript - 将新的键名从旧数组分配给数组

Question

我想将货币数据转换为新数组以用于我的货币转换。但我需要一种不同的数组。我想创建一个如下所示的数组:

json 文件中的数组如下所示:

{
   "eur":{
      "code":"EUR",
      "alphaCode":"EUR",
      "numericCode":"978",
      "name":"Euro",
      "rate":0.83563518721183,
      "date":"Mon, 7 May 2018 00:00:01 GMT"
   },
   "gbp":{
      "code":"GBP",
      "alphaCode":"GBP",
      "numericCode":"826",
      "name":"U.K. Pound Sterling",
      "rate":0.73757713865121,
      "date":"Mon, 7 May 2018 00:00:01 GMT"
   },
etc...
 }

我想让它看起来像:

   {
    rates: {
        AED: 3.672538,
        AFN: 66.809999,
        ALL: 125.716501,
        AMD: 484.902502,
        ANG: 1.788575,
        AOA: 135.295998,
        ARS: 9.750101,
        AUD: 1.390866,
        /* ... */
    }
}

我使用的代码:

$.getJSON(
      'http://www.floatrates.com/daily/usd.json',
      function (data) {
        var newRates = [];
        Object.getOwnPropertyNames(data).forEach(
          function (val, idx, array) {
            var newObj = Object.assign(
              { val },
              { '': data[val].rate });
            newRates.push(newObj);
          }
        );
        console.log(newRates);
    )

Answer 1

您可以通过映射单个对象并将其分配给单个对象来构建对象。

$.getJSON(
    'http://www.floatrates.com/daily/usd.json',
    function(data) {
        var result = Object.assign(
                ...Object
                    .entries(data)
                    .map(([key, { rate }]) => ({ [key.toUpperCase()]: rate }))
            );

        console.log(result);
    }
);

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