Recreate A Json Response Based On Existing Response

I have the json response with value week1,week2,week3,week4 in week key along with count based on category (meetingHash)and week wise.I tried to merge with .reduce but no luck I w

Solution 1:

You need to use map not reduce!

const data = [
    {
        "UserName": "Sarathy Devaraju",
        "week": "Week 1",
        "MeetingHash": "Hold/Uncategorized",
        "monthinwords": "May",
        "count": 2
    },
    {
        "UserName": "Sarathy Devaraju",
        "week": "Week 2",
        "MeetingHash": "Hold/Uncategorized",
        "monthinwords": "May",
        "count": 3
    },
    {
        "UserName": "Sarathy Devaraju",
        "week": "Week 2",
        "MeetingHash": "1st Presentation / Meeting",
        "monthinwords": "Jun",
        "count": 1
    },
    {
        "UserName": "Sarathy Devaraju",
        "week": "Week 1",
        "MeetingHash": "Follow-On Meetings",
        "monthinwords": "Jun",
        "count": 1
    },
    {
        "UserName": "Sarathy Devaraju",
        "week": "Week 2",
        "MeetingHash": "1st Presentation / Meeting",
        "monthinwords": "May",
        "count": 1
    },
    {
        "UserName": "Sarathy Devaraju",
        "week": "Week 3",
        "MeetingHash": "Follow-On Meetings",
        "monthinwords": "July",
        "count": 1
    },
    {
        "UserName": "Priya",
        "week": "Week 1",
        "MeetingHash": "Hold/Uncategorized",
        "monthinwords": "May",
        "count": 2
    },
    {
        "UserName": "Priya",
        "week": "Week 2",
        "MeetingHash": "1st Presentation / Meeting",
        "monthinwords": "Jun",
        "count": 1
    },
    {
        "UserName": "Priya",
        "week": "Week 1",
        "MeetingHash": "Follow-On Meetings",
        "monthinwords": "Jun",
        "count": 1
    },
    {
        "UserName": "Priya",
        "week": "Week 2",
        "MeetingHash": "1st Presentation / Meeting",
        "monthinwords": "May",
        "count": 1
    },
    {
        "UserName": "Priya",
        "week": "Week 1",
        "MeetingHash": "Follow-On Meetings",
        "monthinwords": "July",
        "count": 1
    }
];

constWEEKS = ["Week 1", "Week 2", "Week 3", "Week 4"];

/*
    const result = data.map(obj => {
            return {
                UserName: obj.UserName,
                month: obj.monthinwords,
                meetingHash: obj.MeetingHash,
                Week1: WEEKS.indexOf(obj.week) == 0 ? obj.count : 0,
                Week2: WEEKS.indexOf(obj.week) == 1 ? obj.count : 0,
                Week3: WEEKS.indexOf(obj.week) == 2 ? obj.count : 0,
                Week4: WEEKS.indexOf(obj.week) == 3 ? obj.count : 0,
            }
        }
    );
*/const result = data.reduce((acc, obj) => {
    existingObj = acc.find(ele => ele.UserName == obj.UserName && ele.month == obj.monthinwords && ele.meetingHash == obj.MeetingHash)
    if (existingObj) {
        existingObj.Week1 += WEEKS.indexOf(obj.week) == 0 ? obj.count : 0;
        existingObj.Week2 += WEEKS.indexOf(obj.week) == 1 ? obj.count : 0;
        existingObj.Week3 += WEEKS.indexOf(obj.week) == 2 ? obj.count : 0;
        existingObj.Week4 += WEEKS.indexOf(obj.week) == 3 ? obj.count : 0;
    } else {
        acc.push({
            UserName: obj.UserName,
            month: obj.monthinwords,
            meetingHash: obj.MeetingHash,
            Week1: WEEKS.indexOf(obj.week) == 0 ? obj.count : 0,
            Week2: WEEKS.indexOf(obj.week) == 1 ? obj.count : 0,
            Week3: WEEKS.indexOf(obj.week) == 2 ? obj.count : 0,
            Week4: WEEKS.indexOf(obj.week) == 3 ? obj.count : 0,
        });
    }
    return acc;
}, []);

console.log(result);