Array Of JS Dates How To Group By Days

Question

I\'m trying to figure out the most optimal and with as minimum amount of loops way to group my array of js dates objects from this: (Take a note this is browser console outp

Answer 1

If you need to grouping also by year or (and) month with day - I recommend to use my solution.

In answers above if you'll get different month or year with the same day - your grouping will be incorrect.

Look at the good solution:

_.groupBy(arrayOfDates, function (el) {
      return (el.getFullYear() + '|y|') + (el.getMonth() + '|m|') + (el.getDate() + '|d|');
    });

What I do here? Just create an unique keys for each date, which includes: year, month and day. And then I group an array by this unique key.

result