javascript - 在javascript中按值作为键创建新对象

Question

我想在 JavaScript 中创建一个以值作为键的新对象。我有一个 obj arrobj，如何创建一个具有相同键和值的对象

function createobj(arrobj){
  var newobj = Object.assign({}, ...arrobj.map(e=>Object.values(e.fields)));
  return newobj
}

var arrobj = [{
  fields: {
   service: "finance",
   country: "SG"
  }
}]


Expected Output
var newobj = {
    finance: "finance",
    SG: "SG"
}

Answer 1

您可以获取值，然后将它们缩减为单个对象，并以值作为键:

function createobj(arrobj) {
  return arrobj
    .flatMap((e) => Object.values(e.fields))
    .reduce((p, c) => ((p = { ...p, [c]: c }), p), {});
}

var arrobj = [
  {
    fields: {
      service: "finance",
      country: "SG",
    },
  },
];

console.log(createobj(arrobj));