请教大家个问题，对象数组去除重复数据，并且累加数量？

站长

2024年07月17日 09:24 · 阅读数 15

let arr = [
  {
    code: "10AT",
    batch: "1027",
    store: "001",
    number: 10,
  },
  {
    code: "10AT",
    batch: "1027",
    store: "001",
    number: 10,
  },
  {
    code: "10AT",
    batch: "1027",
    store: "002",
    number: 10,
  },
  {
    code: "10AAT",
    batch: "1027",
    store: "002",
    number: 100,
  },
];

需要将code，batch，store都相同的number累加，并且去除重复项，结果为

let result = [
  {
    code: "10AT",
    batch: "1027",
    store: "001",
    number: 20,
  },
  {
    code: "10AT",
    batch: "1027",
    store: "002",
    number: 10,
  },
  {
    code: "10AAT",
    batch: "1027",
    store: "002",
    number: 100,
  },
];

1个回答

test

2024-07-17

基本思路：分组→按组合计→处理成结果视图

用 Lodash

const result = _(arr).groupBy(({ code, batch, store }) => [code, batch, store].join("|"))
    .values()
    .map(list => {
        const { code, batch, store } = list[0];
        return { code, batch, store, number: _.sumBy(list, "number") };
    })
    .value();

自己写

const result = Object.values(
    arr.reduce((r, { code, batch, store, number }) => {
        const key = `${code}|${batch}|${store}`;
        const item = r[key] ??= { code, batch, store, number: 0 };
        item.number += number;
        return r;
    }, {})
);

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