Remove array elements and populate them in another array in javascript

Question

I'm trying to separate each month's dates in each iteration. I have an array var selected=["pre populated with special dates"] which have all the selected dates. Now in this code how can I modify it to remove the dates for each month from selected[] array and populate thisMonthDates[] with only this particular month's dates in each iteration?

 var ind=start.getMonth();
 var thisMonthDates = [];
 while(ind<=yearDifference){ 
 for (var k = 0; k < selectedArrayLength; k++) {
 if (new Date(selected[k]).getMonth() == monthIndex[ind]) {
 thisMonthDates = selected[k];
 //console.log(new Date(thisMonthDates[k]));
 }
 }
 for(var eachDt=0; eachDt<thisMonthDates.length; eachDt++) {
 //code for highlighting the dates
 }
 ind++;
 }

Following is the selected[] array contents. And thisMonthDates[] is an empty array before the loop.

selected = [Date 2015年01月06日T19:00:00.000Z, 
Date 2015年01月13日T19:00:00.000Z,Date 2015年01月20日T19:00:00.000Z,Date 2015年01月27日T19:00:00.000Z, 
Date 2015年02月03日T19:00:00.000Z,Date 2015年02月10日T19:00:00.000Z,Date 2015年02月17日T19:00:00.000Z, 
Date 2015年02月24日T19:00:00.000Z,Date 2015年03月03日T19:00:00.000Z,Date 2015年03月10日T19:00:00.000Z, 
Date 2015年03月17日T19:00:00.000Z,Date 2015年03月24日T19:00:00.000Z,Date 2015年03月31日T19:00:00.000Z, 
Date 2015年04月07日T19:00:00.000Z,Date 2015年04月14日T19:00:00.000Z,Date 2015年04月21日T19:00:00.000Z, 
Date 2015年04月28日T19:00:00.000Z,Date 2015年05月05日T19:00:00.000Z,Date 2015年05月12日T19:00:00.000Z, 
Date 2015年05月19日T19:00:00.000Z];

• Peter Ashwell: Can you provide some sample input and output?
• a-d: What does selected and thisMonthDates look like before the loop?
• Superman: @PeterAshwell I edited the question with the selected[] array.
• Superman: @aduch I edited the question with the selected[] array.

Answer 1

This loop should do the trick

for (var k = 0; k < selectedArrayLength; k++) {
 if (new Date(selected[k]).getMonth() == monthIndex[ind]) {
 thisMonthDates.push(selected.splice(k, 1));
 k--; // since we removed an element we need to decrement k
 }
}

Answer 2

See if this example helps:

http://plnkr.co/edit/XbnJV0B0bO00o4iJdBtV

var selected = [];
var JANUARY = 0
var FEBRUARY = 1
var MARCH = 2;
selected.push(new Date(2015, FEBRUARY, 15));
selected.push(new Date(2015, JANUARY, 10));
selected.push(new Date(2015, FEBRUARY, 6));
selected.push(new Date(2015, MARCH, 25));
var thisMonth = [];
for (var i = 0; i < selected.length; i++) {
 if (selected[i].getMonth() === FEBRUARY) {
 thisMonth.push(selected[i]);
 }
}
console.log(selected);
console.log(thisMonth);

And the output:

[Sun Feb 15 2015 00:00:00 GMT+1100 (AEDT), Sat Jan 10 2015 00:00:00 GMT+1100 (AEDT), Fri Feb 06 2015 00:00:00 GMT+1100 (AEDT), Wed Mar 25 2015 00:00:00 GMT+1100 (AEDT)]
[Sun Feb 15 2015 00:00:00 GMT+1100 (AEDT), Fri Feb 06 2015 00:00:00 GMT+1100 (AEDT)]

• Superman: And the next time when my loop iterates it again have to iterate through all those dates which creates issue. selected[] array should have to have less elements in it. As you can see there is another loop at the end which will be used to highlight the dates later on.