将键和值拆分为单独对象的有效方法是什么？

Question

我有一个包含一系列键和值的对象。

 var dataset =
    {"diamonds":77,
     "gold-bars":28,
     "exciting-stuff":52,
     "oil":51,
     "sports-cars":7,
     "bitcoins":40};

我想将每个键值拆分到数组中它自己的对象中，所以它看起来像。

var dataset =
    [{"asset":"diamonds", "quantity":77},
      {"asset":"gold-bars", "quantity":28},
      {"asset":"exciting-stuff", "quantity":52},
      {"asset":"oil", "quantity":51},
      {"asset":"bitcoins", "quantity":40},]

我一直在使用下划线，但我不确定这种类型的转换会被称为什么。有好的模式吗？还是我做的不规范？

Answer 1

Use for...in to iterate through object.

The for...in statement iterates over the enumerable properties of an object, in arbitrary order. For each distinct property, statements can be executed.

var obj = {
  "diamonds": 77,
  "gold-bars": 28,
  "exciting-stuff": 52,
  "oil": 51,
  "sports-cars": 7,
  "bitcoins": 40
};
var finalArr = [];
for (var i in obj) {
  if (obj.hasOwnProperty(i)) {
    var myObj = {};
    myObj['asset'] = i;
    myObj['uantity'] = obj[i];
    finalArr.push(myObj);
  }
}
console.log(finalArr);

Fiddle here

Answer 2

您可以使用 Object.keys() and Array.prototype.map() 来达到这个目的。

var dataset = { "diamonds": 77, "gold-bars": 28, "exciting-stuff": 52, "oil": 51, "sports-cars": 7, "bitcoins": 40 },
    result = Object.keys(dataset).map(function (k) { 
        return { asset: k, quantity: dataset[k] };
    });
document.write('<pre>' + JSON.stringify(result, 0, 4) + '</pre>');

Answer 3

如果你使用 Underscore，你可以这样做：

_.map(_.pairs(dataset), _.partial(_.object, ['asset', 'quantity']))

_.pairs 将您的对象转换为 [key, value] 对数组，然后映射到具有 asset 和 quantity 属性的对象。

将键和值拆分为单独对象的有效方法是什么？

What is an efficient way to split keys and values into separate objects?

javascript

object

underscore.js