[Vuejs]-Javascript indexOf in date array always resulting -1

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I think mapping doesn’t require to loop into your array.
and -1 is somehow mean that the date does not exist in your array.

Maybe because in every loop you add a day to it before you see the actual day.

I think you could try:

    var alldays = [...];
    //you should eliminate these two codes
//    datestart = something;
//  dateend = something;
    var holiday;
    for(var i in alldays){
           console.log(alldays.map(Number).indexOf(this.leaveState.currentHoliday));
    }

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