javascript - 一组对象数组

Question

我有这个对象数组

[ { data: 50, note: 1 },
  { data: 0, note: 1 },
  { data: 0, note: 1 },
  { data: 25, note: 1 },
  { data: 0, note: 1 },
  { data: 40, note: 2 },
  { data: 40, note: 2 },
  { data: 20, note: 2 },
  { data: 0, note: 2 },
  { data: 0, note: 2 },
 ]

我需要得到这个

{data:[
  {
   name: 1,
   data:[50,0,0,25,0]
  }
  {
   name: 2,
   data:[40,40,20,0,0]
  }
]}

我试过类似的方法，但我没有得到我需要的结果

for(const {note} of data) {
   if(!result[note]) result[note] = [];
   result[note].push({ data });
 }

Answer 1

你可以拿一个Map并按 note 分组。

var array = [{ data: 50, note: 1 }, { data: 0, note: 1 }, { data: 0, note: 1 }, { data: 25, note: 1 }, { data: 0, note: 1 }, { data: 40, note: 2 }, { data: 40, note: 2 }, { data: 20, note: 2 }, { data: 0, note: 2 }, { data: 0, note: 2 }],
    data = Array.from(
        array.reduce((m, { note, data }) => m.set(note, [...(m.get(note) || []), data]), new Map),
        ([name, data]) => ({ name, data })
    ),
    result = { data };

console.log(result);

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