javascript - Moment.js - Get all mondays between a date range

Question

I have a date range that looks like this

let start = moment(this.absence.FromDate);
let end = moment(this.absence.ToDate);

The user can decide to deactivate specific week days during that date range, so I have booleans

monday = true;
tuesday = false;
...

I want to create a function that allows me to put all mondays during my date range in an array.

I've looked around on stack but I can only find help for people who need all the monday from a month for example.

Answer 1

You can get next Monday using .day(1) and then loop until your date isBefore your end date adding 7 days for each iteration using add

Here a live sample:

//let start = moment(this.absence.FromDate);
//let end = moment(this.absence.ToDate);

// Test values
let start = moment();
let end = moment().add(45 , 'd');

var arr = [];
// Get "next" monday
let tmp = start.clone().day(1);
if( tmp.isAfter(start, 'd') ){
  arr.push(tmp.format('YYYY-MM-DD'));
}
while( tmp.isBefore(end) ){
  tmp.add(7, 'days');
  arr.push(tmp.format('YYYY-MM-DD'));
}
console.log(arr);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>