javascript string date from array and group by day and return new array per day

Question

I got a array of data the data is dates they are sorted per day. Wat i want to get is the data grouped by date(day) and all the data of every day needs to be in new and separated array. my data can be short 1 date string in 1 day or very long month's or year

My data:

accountDateArray = [
Mon Jun 08 2020 19:47:16 GMT+0200 (Midden-Europese zomertijd),
Mon Jun 08 2020 19:47:26 GMT+0200 (Midden-Europese zomertijd),
Mon Jun 08 2020 19:47:34 GMT+0200 (Midden-Europese zomertijd),
Tue Jun 09 2020 15:40:31 GMT+0200 (Midden-Europese zomertijd),
Tue Jun 09 2020 15:42:28 GMT+0200 (Midden-Europese zomertijd),
Wed Jun 10 2020 00:06:50 GMT+0200 (Midden-Europese zomertijd),
Wed Jun 10 2020 00:06:50 GMT+0200 (Midden-Europese zomertijd),
Wed Jun 10 2020 08:10:51 GMT+0200 (Midden-Europese zomertijd),
Fri Jun 12 2020 10:59:21 GMT+0200 (Midden-Europese zomertijd),
...
]

What i want is:

[
 [
 Mon Jun 08 2020 19:47:16 GMT+0200 (Midden-Europese zomertijd),
 Mon Jun 08 2020 19:47:26 GMT+0200 (Midden-Europese zomertijd),
 Mon Jun 08 2020 19:47:34 GMT+0200 (Midden-Europese zomertijd),
 ],
 [
 Tue Jun 09 2020 15:40:31 GMT+0200 (Midden-Europese zomertijd),
 Tue Jun 09 2020 15:42:28 GMT+0200 (Midden-Europese zomertijd),
 ],
  ...
]

My code

     let NewDateArray = [];
          for (let i in accountDateArray) {
            NewDateArray.push(accountDateArray[i].toString().substring(0, 10));
          }
          let unique = [...new Set(NewDateArray)];

          for (let i in accountDateArray) {
            for (let n in unique) {
              if (
                unique[n] === accountDateArray[i].toString().substring(0, 10)
              ) {
                console.log(accountDateArray[i]);
              }
            }
          }

You can make use of reduce() to achieve your task.

Rajneesh
– Rajneesh

2020-06-13 11:09:25 +00:00
Commented Jun 13, 2020 at 11:09 — Rajneesh
– Rajneesh, Commented Jun 13, 2020 at 11:09

Rajneesh · Accepted Answer · 2020-06-13 11:16:02Z

3

You can make use of reduce function, I hope this will lead you to the right direction.

var accountDateArray = ['Mon Jun 08 2020 19:47:16 GMT+0200 (Midden-Europese zomertijd)','Mon Jun 08 2020 19:47:26 GMT+0200 (Midden-Europese zomertijd)','Mon Jun 08 2020 19:47:34 GMT+0200 (Midden-Europese zomertijd)','Tue Jun 09 2020 15:40:31 GMT+0200 (Midden-Europese zomertijd)','Tue Jun 09 2020 15:42:28 GMT+0200 (Midden-Europese zomertijd)','Wed Jun 10 2020 00:06:50 GMT+0200 (Midden-Europese zomertijd)','Wed Jun 10 2020 00:06:50 GMT+0200 (Midden-Europese zomertijd)','Wed Jun 10 2020 08:10:51 GMT+0200 (Midden-Europese zomertijd)','Fri Jun 12 2020 10:59:21 GMT+0200 (Midden-Europese zomertijd)',];

var result = Object.values(accountDateArray.reduce((acc, date)=>{
    const key = new Date(date).getDate();
    acc[key] = [...(acc[key] || []), date];
    return acc;
},{}));

console.log(result);

answered Jun 13, 2020 at 11:16

Rajneesh

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1 Comment

Eric. M Over a year ago

Thank you very much ! its what is was looking for

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