Convert number to Hebrew letters js

gistfile1.js

//https://stackoverflow.com/a/30676253/12782960 in c#

function formatHebrew(num) {
  if(num <= 0) return
  
  let ret = 'ת'.repeat(Math.floor(num / 400));
  num %= 400;
  
  if(num >= 100) {
    ret += "קרש"[Math.floor(num / 100) - 1];
    num %= 100;
  }
  
  switch(num) {
    // Avoid letter combinations from the Tetragrammaton
    case 16:
      ret += "טז";
      break;
    case 15:
      ret += "טו";
      break;
    default:
      if (num >= 10) {
        ret += "כלמנסעפצי"[Math.floor(num / 10) - 1];
        num %= 10;
      }
      if(num > 0) {
        ret += "אבגדהוזחט"[num - 1];
      }
      break;
  }
  
  return ret;
}