javascript - 合并具有相同 JSON 键的对象

Question

我在按键将 JSON 对象数组合并在一起时遇到一些麻烦。有人能用 Javascript 找到一个好的解决方案吗？

{
    "code": "12345",
    "error": "12345 error 1"
},
{
    "code": "12345",
    "error": "12345 error 2"
},
{
    "code": "67890",
    "error": "67890 error 1"
},
{
    "code": "67890",
    "error": "67890 error 2"
},
{
    "code": "67890",
    "error": "67890 error 3"
},
{
    "code": "67890",
    "error": "67890 error 4"
},
{
    "code": "67890",
    "error": "67890 error 5"
},
{
    "code": "12092",
    "error": "12092 error 1"
},
{
    "code": "12092",
    "error": "12092 error 2"
}

应转换为

{
    "code": "12345",
    "error": "12345 error 1, 12345 error 2"
},
{
    "code": "67890",
    "error": "67890 error 1, 67890 error 2, 67890 error 3, 67890 error 4, 67890 error 5"
},
{
    "code": "12092",
    "error": "12092 error 1, 12092 error 2"
}

任何帮助将不胜感激。我为这个问题绞尽脑汁很久了，但似乎就是想不明白。

Answer 1

使用数组reduce创建新的合并对象数组。在回调函数内检查累加器数组是否有一个已经具有code的对象。为此，请使用findIndex。如果代码匹配，则更新错误。否则将当前对象压入累加器

const data = [{"code":"12345","error":"12345 error 1"},{"code":"12345","error":"12345 error 2"},{"code":"67890","error":"67890 error 1"},{"code":"67890","error":"67890 error 2"},{"code":"67890","error":"67890 error 3"},{"code":"67890","error":"67890 error 4"},{"code":"67890","error":"67890 error 5"},{"code":"12092","error":"12092 error 1"},{"code":"12092","error":"12092 error 2"}];

let mergedData = data.reduce(function(acc, curr) {
  let findIndex = acc.findIndex(function(item) {
    return item.code === curr.code;
  })
  if (findIndex === -1) {
    acc.push(curr)
  } else {
    acc[findIndex].error += ', ' + curr.error
  }
  return acc;
}, []);

console.log(mergedData)