All the hours in a day in 12-hour clock format with a defined inverval

load-hours.js

/**
 * All the hours in a day in 12-hour clock format with a defined inverval
 *
 * @example
 * // returns [
 *    '12:00 AM',
 *    '12:15 AM',
 *    '12:30 AM',
 *    '12:45 AM',
 *    '01:00 AM',
 *    ...,
 *    '11:30 PM'
 *    '11:45 PM'
 * ]
 * loadHours(4, 'hh:mm A');
 *
 * @param hourPartitionSize - the interval of required minutes in an hour (ex: 4 represents 60/4 -> 15 min)
 * @param dateFormat - the dateFormat to return in momentjs way
 * @returns {Array}
 */
function loadHours(hourPartitionSize, dateFormat) {
  hourPartitionSize = _.defaultTo(hourPartitionSize, 4);
  dateFormat = _.defaultTo(dateFormat, 'hh:mm A');

  var TOTAL_HOURS_IN_DAY = 24;
  var TOTAL_MINUTES_IN_HOUR = 60;

  var totalIntervals = TOTAL_HOURS_IN_DAY * hourPartitionSize;
  var intervalMinute = TOTAL_MINUTES_IN_HOUR / hourPartitionSize;
  var mDate = moment().startOf('day');

  return _.times(totalIntervals, function() {
    var hour = mDate.format(dateFormat);
    mDate.add(intervalMinute, 'minutes');

    return hour;
  });
}

// lodash 4.x
// moment 2.x