javascript - 映射一个数组并检查特定键是否具有相同的值，然后将两者合并

Question

这是我想要实现的目标:
我有这个数组:

const data = [
  { paidOn: "01", workstreamName: "Leeann",   amount: 242759 },
  { paidOn: "02", workstreamName: "Angelico", amount: 58142  },
  { paidOn: "03", workstreamName: "Zorine",   amount: 419310 },
  { paidOn: "02", workstreamName: "Janine",   amount: 135015 },
  { paidOn: "04", workstreamName: "Shannon",  amount: 6396   },
  { paidOn: "01", workstreamName: "Wang",     amount: 198277 },
];

我需要找到所有具有相似值的“paidOn”键并将它们合并。

使用 workstreamName 值作为键，使用数量值作为新键的值。

所以输出看起来像这样:

const data = [
  { paidOn:"01", "Leeann":  242759, "Wang":   198277 },
  { paidOn:"02", "Angelico": 58142, "Janine": 135015 },
  { paidOn:"03", "Zorine":  419310  },
  { paidOn:"04", "Shannon":  6396   }
  ];

到目前为止，我已经设法使用以下代码实现了第 2 步，但无法弄清楚如何实现第 1 步:

const data = [
  { paidOn: "01", workstreamName: "Leeann", amount: 242759 },
  { paidOn: "02", workstreamName: "Angelico", amount: 58142 },
  { paidOn: "03", workstreamName: "Zorine", amount: 419310 },
  { paidOn: "04", workstreamName: "Janine", amount: 135015 },
  { paidOn: "05", workstreamName: "Shannon", amount: 6396 },
  { paidOn: "05", workstreamName: "Wang", amount: 198277 },
  { paidOn: "06", workstreamName: "Maurise", amount: 389081 },
  { paidOn: "07", workstreamName: "Nike", amount: 125030 },
  { paidOn: "08", workstreamName: "Teodor", amount: 142803 },
  { paidOn: "08", workstreamName: "Stefan", amount: 398831 },
  { paidOn: "09", workstreamName: "Fancy", amount: 353254 },
  { paidOn: "10", workstreamName: "Salli", amount: 492496 },
  { paidOn: "10", workstreamName: "Daniela", amount: 147206 },
  { paidOn: "11", workstreamName: "Tandy", amount: 362225 },
  { paidOn: "11", workstreamName: "Sidnee", amount: 381233 },
  { paidOn: "11", workstreamName: "Kordula", amount: 86582 },
  { paidOn: "12", workstreamName: "Dedra", amount: 443826 },
  { paidOn: "02", workstreamName: "Essy", amount: 449565 },
];

const workstreamNames = data.map((item) => {
  return item.workstreamName
});

const amount = data.map((item) => {
  return item.amount
});

const res = Object.fromEntries(workstreamNames.map((_, i) => [workstreamNames[i], amount[i]]))

console.log(res);

将不胜感激任何帮助或指针。

Answer 1

这是您可以做到的一种方法 - 这会修改 this answer返回自定义字典:

const data = [
  { paidOn: "01", workstreamName: "Leeann", amount: 242759 },
  { paidOn: "02", workstreamName: "Angelico", amount: 58142 },
  { paidOn: "03", workstreamName: "Zorine", amount: 419310 },
  { paidOn: "02", workstreamName: "Janine", amount: 135015 },
  { paidOn: "04", workstreamName: "Shannon", amount: 6396 },
  { paidOn: "01", workstreamName: "Wang", amount: 198277 },
];

const key = "paidOn";

const result = Object.values(data.reduce(function(acc, x) {
    const sub = (acc[x[key]] = acc[x[key]] || {"paidOn": x[key]});
    sub[x["workstreamName"]] = x["amount"];
    return acc;
  }, {}));

console.log(result);

注:这是一个 O(n) 方法。