javascript - 过滤重复键

Question

拜托，我是新手。我进行了搜索，所见所闻让我感到困惑。

如何减少数组中的重复项并将重复键的值添加到唯一键，如下所示。

我想让它像arrayA

let arrayA = [
  { name: "temperature", data: {"2000-09-26": 82} },
  { name: "temperature", data: {"1997-03-08": 71} },
  { name: "current", data: {"1993-08-11": 79} },
  { name: "frequency", data: {"2004-01-17": 16} },
  { name: "current", data: {"1997-02-14": 65} }
]

let arrayB = [
  { name: "temperature", data: {"2000-09-26": 82, "1997-03-08": 71} },
  { name: "current", data: {"1993-08-11": 79, "1997-02-14": 65} },
  { name: "frequency", data: {"2004-01-17": 16} }
]

Answer 1

您可以使用 array#reduce 和 Object.values()。创建 name 的散列并为给定的 name 添加 data 值。然后使用 Object.values() 从对象中获取值。

let arrayA = [ { name: "temperature", data: {"2000-09-26": 82} }, { name: "temperature", data: {"1997-03-08": 71} }, { name: "current", data: {"1993-08-11": 79} }, { name: "frequency", data: {"2004-01-17": 16} }, { name: "current", data: {"1997-02-14":
65} } ],
    result = Object.values(arrayA.reduce((r,{name, data}) => {
      r[name] = r[name] || {name, data: {}};
      Object.assign(r[name].data, data);
      return r;
    },{}));
console.log(result);