Javascript 迭代对象并替换值

发布于05月15日

我有这个目标:

{
  "data": {
    "success": true,
    "historical": true,
    "date": "2022-01-01",
    "base": "MXN",
    "rates": {
      "COFFEE": 0.02158734144632395,
      "CORN": 0.008232645172711363,
      "COTTON": 0.04320921676820366,
      "SOYBEAN": 0.0036714622235960175,
      "SUGAR": 0.25680398615582695,
      "WHEAT": 0.00017592643558262669
    },
    "unit": "per bushel"
  }
}

And I want to iterate over "rates" to replace the values of each key with 1 / value
I tried with: (prueba is the Object name)

Object.values(this.prueba.data.rates).forEach((val) => {
      console.log(val)
      val = 1 / val;
      console.log(val)
    })

但是如何替换这些值，或者如何将它们保存在另一个数组或对象中

推荐答案

您的代码无法工作，因为您对val所做的更改只反映在回调的范围内.

相反，您应该遍历每个属性并设置其值.

const obj={data:{success:!0,historical:!0,date:"2022-01-01",base:"MXN",rates:{COFFEE:.02158734144632395,CORN:.008232645172711363,COTTON:.04320921676820366,SOYBEAN:.0036714622235960175,SUGAR:.25680398615582695,WHEAT:.00017592643558262669},unit:"per bushel"}};

let r = obj.data.rates;
Object.keys(r).forEach(e => r[e] = 1 / r[e])
console.log(obj)

如果您使用的是Typescript，则有必要这样声明对象: