JSON array of objects. group the objects values on name

Question

I'm trying to get with Javascript JSON object values to be grouped based on the name key word in the array that contains the objects this is a dynamic array so this cannot be hard coded.

the objects have time values in it

the time_entries array length changes.

the time_entries array can have 1 or more objects in it.

I want to group the objects by the time: Hour minutes seconds

{
    "activities": [
        {
            "name": "player one",
            "time_entries": [
                {
                    "days": 0,
                    "end_time": "2019-09-30 15:19:43",
                    "hours": 01,
                    "minutes": 02,
                    "seconds": 11,
                    "start_time": "2019-09-30 14:17:58"
                },
                {
                    "days": 0,
                    "end_time": "2019-09-25 15:40:11",
                    "hours": 0,
                    "minutes": 20,
                    "seconds": 4,
                    "start_time": "2019-09-25 15:20:15"
                },
                {
                    "days": 0,
                    "end_time": "2019-09-25 16:10:15",
                    "hours": 0,
                    "minutes": 30,
                    "seconds": 4,
                    "start_time": "2019-09-25 15:40:11"
                },

#there can be more objects here

            ]
        },
        {
            "name": "player two",
            "time_entries": [
                {
                    "days": 0,
                    "end_time": "2019-09-30 19:18:51",
                    "hours": 0,
                    "minutes": 0,
                    "seconds": 52,
                    "start_time": "2019-09-30 19:17:58"
                },

#there can be more objects here

            ]
        },
        {
            "name": "player three",
            "time_entries": [
                {
                    "days": 0,
                    "end_time": "2019-09-30 19:19:09",
                    "hours": 0,
                    "minutes": 0,
                    "seconds": 58,
                    "start_time": "2019-09-30 19:18:51"
                },
                {
                    "days": 0,
                    "end_time": "2019-09-30 21:21:09",
                    "hours": 2,
                    "minutes": 1,
                    "seconds": 0,
                    "start_time": "2019-09-30 19:20:09"
                },

#there can be more objects here

            ]
        }
    ]
}

What I want to get is something like this

 [
        {
            "name": "player one",
            "time_entries": [
                {
                    "days": 0,
                    "end_time": "2019-09-25 16:10:15",
                    "hours": 01,
                    "minutes": 50,
                    "seconds": 19,
                    "start_time": "2019-09-30 14:17:58"
                }
            ]
        },
        {
            "name": "player two",
            "time_entries": [
                {
                    "days": 0,
                    "end_time": "2019-09-30 19:18:51",
                    "hours": 0,
                    "minutes": 0,
                    "seconds": 52,
                    "start_time": "2019-09-30 19:17:58"
                }
            ]
        },
        {
            "name": "player three",
            "time_entries": [
                {
                    "days": 0,
                    "end_time":"2019-09-30 21:21:09",
                    "hours": 2,
                    "minutes": 1,
                    "seconds": 58,
                    "start_time": "2019-09-30 19:18:51"
                }
            ]
        }
]

not clear on what you want to achieve. what have you already tried? share the code that you have already tried. minimal reproducible example — Searching
– Searching, Commented Oct 23, 2019 at 16:17
I'm confusing with your requirements but here are many ways to group your array stackoverflow.com/questions/14446511/… — André Andrade
– André Andrade, Commented Oct 23, 2019 at 16:19
I don't see any grouping going on here. Are you asking how to combine multiple time entries? Your desired output shows only one item in time_entries arrays. We need a better description of what you're trying to do. — Jacob
– Jacob, Commented Oct 23, 2019 at 17:06
@Jacob yes im trying to combine multiple time entries? . in the desired output the data from the json data is combined for example the first time_entries array has 3 objects they need to be combined in to 1 object — Eric. M
– Eric. M, Commented Oct 23, 2019 at 17:39
@Searching i have only loopd over the data with foreach, i'm new in javascript so i dont know how i can possibly start at this, i hoop maybe i can find a clue here. thanks for the help — Eric. M
– Eric. M, Commented Oct 23, 2019 at 17:42

Nikhil · Accepted Answer · 2019-10-23 18:11:40Z

You can do it as follows:

Use map() method to iterate on given activities and transform each activity's time_entries property.
getTimeEntry() method takes array of time entries and returns earliest start time, latest end time, and total activity time converted to days, hours, minutes, seconds.

let data = { "activities": [ { "name": "player one", "time_entries": [ { "days": 0, "end_time": "2019-09-30 15:19:43", "hours": 01, "minutes": 02, "seconds": 11, "start_time": "2019-09-30 14:17:58" }, { "days": 0, "end_time": "2019-09-25 15:40:11", "hours": 0, "minutes": 20, "seconds": 4, "start_time": "2019-09-25 15:20:15" }, { "days": 0, "end_time": "2019-09-25 16:10:15", "hours": 0, "minutes": 30, "seconds": 4, "start_time": "2019-09-25 15:40:11" } ] }, { "name": "player two", "time_entries": [ { "days": 0, "end_time": "2019-09-30 19:18:51", "hours": 0, "minutes": 0, "seconds": 52, "start_time": "2019-09-30 19:17:58" } ] }, { "name": "player three", "time_entries": [ { "days": 0, "end_time": "2019-09-30 19:19:09", "hours": 0, "minutes": 0, "seconds": 58, "start_time": "2019-09-30 19:18:51" }, { "days": 0, "end_time": "2019-09-30 21:21:09", "hours": 2, "minutes": 1, "seconds": 0, "start_time": "2019-09-30 19:20:09" } ] } ] };

let result = {};

result.activities = data.activities.map(item => {
  return {
    "name": item.name,
    "time_entries": [getTimeEntry(item.time_entries)]
  };
});

function getTimeEntry(timeEntries) {
  let earliestTime = timeEntries[0].start_time;
  let latestTime = timeEntries[0].end_time;

  // Find earliest start time and latest end time.
  timeEntries.forEach(entry => {
    if (new Date(entry.start_time) < new Date(earliestTime)) {
      earliestTime = entry.start_time;
    }

    if (new Date(entry.end_time) > new Date(latestTime)) {
      latestTime = entry.end_time;
    }
  });

  // Calculate total seconds.
  let seconds = timeEntries.reduce((totalSeconds, currentEntry) => {
    let seconds = 0;

    seconds += currentEntry.seconds;
    seconds += currentEntry.minutes * 60;
    seconds += currentEntry.hours * 60 * 60;
    seconds += currentEntry.days * 24 * 60 * 60;

    return totalSeconds + seconds;
  }, 0);

  // Convert total seconds to days, hours, minutes, and seconds.
  let days = Math.floor(seconds / (24 * 60 * 60));
  seconds = seconds % (24 * 60 * 60);
  let hours = Math.floor(seconds / (60 * 60));
  seconds = seconds % (60 * 60);
  let minutes = Math.floor(seconds / 60);
  seconds = seconds % 60;

  return {
    "start_time": earliestTime,
    "end_time": latestTime,
    "days": days,
    "hours": hours,
    "minutes": minutes,
    "seconds": seconds
  };
}

console.log(result);

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