How To Get Week Numbers Of Current Month In Moment.js

I want to get the week numbers of a particular month eg: January 2017 ,the weeknumbers in this months are [52,1,2,3,4,5] So how to get the above in an array? Thanks

Solution 1:

const firstDayOfMonth = moment(`${ year }-${ month }`, 'YYYY-MM-DD');
 const numOfDays = firstDayOfMonth.daysInMonth();
 let weeks = newSet();

 for(let i = 0; i < numOfDays; i++){
     const currentDay = moment(firstDayOfMonth, 'YYYY-MM-DD').add(i, 'days');

     weeks.add(currentDay.isoWeek());
 }

 returnArray.from(weeks)

Solution 2:

So more efficiently:

const firstDayOfMonth = moment(`${ year }-${ month }`, 'YYYY-MM-DD');
 let weekIndices = [];

 let currentDay = moment(firstDayOfMonth, 'YYYY-MM-DD');
 weekIndices.push(currentDay.isoWeek());

 while(currentDay.month() === firstDayOfMonth.month()) {
     currentDay.add(1, 'weeks');
     weekIndices.push(currentDay.isoWeek());
 }

return weekIndices;

Solution 3:

I know I should not, but I like this question :) can you improove this?

functionshowWeeks(year, month) {

      let firstWeek = moment(newDate(year,month,1)).isoWeek();
      let lastWeek = moment(newDate(year,month+1,0)).isoWeek();

      let out = [firstWeek];
      if (firstWeek === 52 || firstWeek === 53) {
        firstWeek=0;
      }

      for ( let i = firstWeek+1; i<= lastWeek; i++) {
        out.push(i);
      }

      return out;
    }

    console.log(showWeeks(2017, 0)); // [52, 1, 2, 3, 4, 5]console.log(showWeeks(2021, 0)); // [53, 1, 2, 3, 4]console.log(showWeeks(2017, 11)); // [48, 49, 50, 51, 52]console.log(showWeeks(1986, 9)); // [40, 41, 42, 43, 44]