cal-jalaali-2.js

function between(number, start, end) { 
  return number >= start && number <= end;
}

function makeWidth(day) {
  if (between(day, 1,   9)) { return day + "     " }
  if (between(day, 10, 31)) { return day + "    "  }
  return "      ";
}

function addDay(row, day) {
  return row + makeWidth(day);
}

function makeDaysRow(days) {
  return days.reduce(addDay, "");
}

function addDaysRowToTable(table, days) {
  return table + makeDaysRow(days) + "\n";
}

function daysTable(year, month) {
  return jalaali.monthMatrix(year, month).reduce(addDaysRowToTable, "");
}

function daysTableHeader() {
  return "J     P     Ch    Se    D     Y     S\n"
       + "--------------------------------------\n";
}

/**
 * Representation of a Month, in the form of a textual table.
 * 
 * @example monthTable(1397, 1)
 * 
 *         J     P     Ch    Se    D     Y     S
 *         --------------------------------------
 *         3     2     1                             
 *         10    9     8     7     6     5     4     
 *         17    16    15    14    13    12    11    
 *         24    23    22    21    20    19    18    
 *         31    30    29    28    27    26    25   
 */
function monthTable(year, month) {
  return daysTableHeader() + daysTable(year, month);
}