Question

我有一个for循环，该循环生成具有多个键和每个键一个值的字典。

{AdvanceAxes: "NaN", AnalSect: "Rigid_Conc", Angle: NaN, AutoSelect: "N.A.", CaseType: "Combination", …}

我想将这些词典合并为一个词典。以一种方式在每次迭代时追加到字典最终结果将是一个数组字典，其键与每次迭代中出现的字典具有相同的键。像这样：

{AdvanceAxes: Array(9168), AnalSect: Array(9168), Angle: o(9168), AutoSelect: Array(9168), CaseType: Array(9168), …}

到目前为止，我失败了。有没有办法用Javascript实现呢？

Answer 1

您可以像这样使用reduce：

let data = [
    {AdvanceAxes: "NaN", AnalSect: "Rigid_Conc", Angle: NaN, AutoSelect: "N.A.", CaseType: "Combination"},
    {AdvanceAxes: "NaN", AnalSect: "Rigid_Conc", Angle: NaN, AutoSelect: "N.A.", CaseType: "Combination"},
    {AdvanceAxes: "NaN", AnalSect: "Rigid_Conc", Angle: NaN, AutoSelect: "N.A.", CaseType: "Combination"},
];

// iterate data array and use empty object "a" as accumulator
let dict = data.reduce((a, e) => 
  // iterate each object entry as [key, value] and use "a" as accumulator
  Object.entries(e).reduce((a, t) => {
      // create an empty array on "a" for each key (if it does not exist yet)
      // then push current value to it
      (a[t[0]] = a[t[0]] || []).push(t[1]);
      return a;
  }, a), {});

console.log(dict);

Javascript，将多个词典合并为一个词典

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