Merge array of objects based on overall key of object [duplicate]

Question

I have this array of objects

var worksSummaryDetailsArr = [
  {
    year: 2020,
    worksSummaryDetailsObj: [ [Object], [Object], [Object], [Object] ]
  },
  {
    year: 2021,
    worksSummaryDetailsObj: [ [Object], [Object], [Object], [Object] ]
  },
  {
    year: 2022,
    worksSummaryDetailsObj: [ [Object], [Object], [Object], [Object] ]
  },
  {
    year: 2021,
    worksSummaryDetailsObj: [ [Object], [Object], [Object], [Object] ]
  },
  {
    year: 2022,
    worksSummaryDetailsObj: [ [Object], [Object], [Object], [Object] ]
  }
]

I want to merge it into


  {
    year: 2020,
    worksSummaryDetailsObj: [ [Object], [Object], [Object], [Object] ]
  },
  {
    year: 2021,
    worksSummaryDetailsObj: [ [Object], [Object], [Object], [Object],[Object], [Object], [Object], [Object] ]
  },
  {
    year: 2022,
    worksSummaryDetailsObj: [ [Object], [Object], [Object], [Object],[Object], [Object], [Object], [Object] ]
  },

I have tried using the set function and mapping with the same year, and the output was the same years were merged correctly but the worksSummaryDetailsObj contains wrong data

here is my code


const r = [...new Set(worksSummaryDetailsArr.map((i) => i.year))].map((i) => ({
      year: i,
      worksSummaryDetailsObj: [...new Set(worksSummaryDetailsArr.filter(({ year: c }) => c === i))],
}));

console.log(r);

I linked some options but this has been asked many times

Mark Schultheiss
– Mark Schultheiss

2023-09-25 13:34:29 +00:00
Commented Sep 25, 2023 at 13:34 — Mark Schultheiss
– Mark Schultheiss, Commented Sep 25, 2023 at 13:34

skmail · Accepted Answer · 2023-09-25 13:25:18Z

0

a simple reduce and array merge could achieve what you want

Object.values(
  worksSummaryDetailsArr.reduce((acc, arr) => {
    if (!acc[arr.year]) {
      acc[arr.year] = arr;
    } else {
      acc[arr.year] = {
        ...acc[arr.year],
        worksSummaryDetailsObj: [
          ...acc[arr.year].worksSummaryDetailsObj,
          ...arr.worksSummaryDetailsObj,
        ],
      };
    }
    return acc;
  }, {})
);

answered Sep 25, 2023 at 13:25

skmail

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