convertNumberToLao.js

const convertToLaoNumberString = (num, suffix) => {
   "use strict";

   if (typeof suffix === "undefined") {
      suffix = "ຖ້ວນ";
   }

   num = num || 0;
   num = num.toString().replace(/[, ]/g, ""); // remove commas, spaces

   if (isNaN(num) || Math.round(parseFloat(num) * 100) / 100 === 0) {
      return "ສູນຖ້ວນ";
   } else {
      var t = ["", "ສິບ", "ຮ້ອຍ", "ພັນ", "ໝື່ນ", "ແສນ", "ລ້ານ"],
         n = [
            "",
            "ໜຶ່ງ",
            "ສອງ",
            "ສາມ",
            "ສີ່",
            "ຫ້າ",
            "ຫົກ",
            "ເຈັດ",
            "ແປດ",
            "ເກົ້າ",
         ],
         len,
         digit,
         text = "",
         parts,
         i;

      if (num.indexOf(".") > -1) {
         // have decimal

         /* 
             * precision-hack
             * more accurate than parseFloat the whole number 
             */

         parts = num.toString().split(".");

         num = parts[0];
         const decimal = parts[1];
         parts[1] = parseFloat("0." + parts[1]);
         parts[1] = (Math.round(parts[1] * 100) / 100).toString(); // more accurate than toFixed(2)
         parts = parts[1].split(".");

         if (parts.length > 1 && parts[1].length === 1) {
            parts[1] = parts[1].toString() + "0";
         }

         num = parseInt(num, 10) + parseInt(parts[0], 10);

         /* 
             * end - precision-hack
             */
         text = num ? convertToLaoNumberString(num) : "";
         const translateNumber = (number) => {
            switch (number) {
               case "0":
                  return "ສູນ";
               case "1":
                  return "ໜຶ່ງ";
               case "2":
                  return "ສອງ";
               case "3":
                  return "ສາມ";
               case "4":
                  return "ສີ່";
               case "5":
                  return "ຫ້າ";
               case "6":
                  return "ຫົກ";
               case "7":
                  return "ເຈັດ";
               case "8":
                  return "ແປດ";
               case "9":
                  return "ເກົ້າ";
               default:
                  return number;
            }
         };

         const convertToRegularLaoNumber = (number) => {
            const numberArray = number.split("");
            console.log(numberArray);
            const laoNumbers = numberArray.map((item) => {
               return translateNumber(item);
            });

            return laoNumbers.join("");
         };

         if (parts[1]) {
            text = text + "ຈຸດ" + convertToRegularLaoNumber(decimal);
         }

         if (parseInt(parts[1], 10) > 0) {
            text = text.replace("ຖ້ວນ", "");
         }

         return text;
      } else {
         console.log({ num });
         if (num.length > 7) {
            // more than (or equal to) 10 millions

            var overflow = num.substring(0, num.length - 6);
            var remains = num.slice(-6);
            return (
               convertToLaoNumberString(overflow).replace("ຖ້ວນ", "ລ້ານ") +
               convertToLaoNumberString(remains).replace("ສູນ", "")
            );
         } else {
            len = num.length;
            for (i = 0; i < len; i = i + 1) {
               digit = parseInt(num.charAt(i), 10);
               if (digit > 0) {
                  if (
                     len > 2 &&
                     i === len - 1 &&
                     digit === 1 &&
                     suffix !== "ຈຸດ"
                  ) {
                     text += "ເອັດ" + t[len - 1 - i];
                  } else {
                     text += n[digit] + t[len - 1 - i];
                  }
               }
            }

            // grammar correction
            text = text.replace("ໜຶ່ງສິບ", "ສິບ");
            text = text.replace("ສອງສິບ", "ຊາວ");
            text = text.replace("ສິບໜຶ່ງ", "ສິບເອັດ");
            console.log({ text, suffix });
            return text + suffix;
         }
      }
   }
}