Get days of week for date range, javascript

Question

I have date range

var fromDate = "2017-01-05";
var toDate = "2017-01-10";

How can I get days of the week that belong to that range?

A range can be different, it can be 2016-12-25 to 2017-05-05, etc. I need to return unique days of the week from provided date range.

The result should be an array of days of weeks. For first range should be ["Thursday", "Friday", "Saturday", "Sunday", "Monday", "Tuesday"]

Moment can be used if needed, but no jQuery.

Answer 1

Here is one possible solution:

1. Get all dates from the range.

2. Loop through the result of step one and return the days of the week:

   var dates = [...]; //(step one result)
   let weekdays = [];
   for (var i = 0; i < dates.length; i++) {
       weekdays.push(moment(dates[i]).day())
   }
   

3. Make an array of weekdays:

   var wkDays = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
   

4. Get the day names:

   let weekdaysNamesRange = [];
   for (var i = 0; i < weekdays.length; i++) {
       for (var j = 0; j < wkDays.length; j++) {
           if (weekdays[i] === j) {
              weekdaysNamesRange.push(wkDays[j]);
            }
        }
    }
   

5. Get unique days:

   var unique = weekdaysNamesRange.filter((item, index, ar) => {
       return weekdaysNamesRange.indexOf(item) === index;
   });
   

I guess there is a better solution, but this is all I came up with.