javascript - 根据键值合并对象数组

Question

我将如何转动这样的对象数组

const scores = [
{
   year: 2020,
   dave: 20
},
{
   year: 2020,
   steve: 17
},
{
   year: 2019,
   bill: 18
}
];

进入这个

const scores = [
{
   year: 2020,
   dave: 20,
   steve: 17
},
{
   year: 2019,
   bill: 18
}
];

标签： javascriptecmascript-6lodash

Answer 1

我使用了一个Array.reduce()并有一个带有键的对象作为年份并继续分配对象，后来取出了值。

const scores = [
  {
     year: 2020,
     dave: 20
  },
  {
     year: 2020,
     steve: 17
  },
  {
     year: 2019,
     bill: 18
  }
];

const mergedOb = scores.reduce((acc, ob) => {
  if (acc[ob.year]) {
    Object.assign(acc[ob.year], ob);
  } else {
    acc[ob.year] = ob
  }
  return acc;
}, {});

const mergeArr = Object.values(mergedOb)
console.log(mergeArr)