Refactor jquery ui datepicker code from .each to .filter & .map

gistfile1.js

// before
var schedulesTmp = $('form#interview-schedule input[name^="schedule-datetime"]');
var schedules1   = [];
schedulesTmp.each(function() {
    if (null !== $(this).datepicker('getDate')) {
        schedules1.push($(this).val());
    }
});
alert(schedules1.length + ' ' + schedules1[0] + ' ');
 
// after
var schedules2 = $('form#interview-schedule input[name^="schedule-datetime"]').filter(function() {
    return null !== $(this).datepicker('getDate');
}).map(function(i, n) {
    return $(n).val();
}).get();
alert(schedules2.length + ' ' + schedules2[0] + ' ');