Reversing a Odia Unicode String

Odia is a language with lot of combining characters. Therefore simple reversal of string like str.split('').reverse().join('') will not work . With this naive approach, the reverse of string like ଜଳାର୍ଣ୍ଣବ will end up in ବଣ୍ଣ୍ରାଳଜ where as the expected reversal would be ବର୍ଣ୍ଣଳାଜ. 

Even I failed with BreakIterator of Java with Odia Locale. I also tried packages like esrever but failed. Finally I tried with basic decomposition of Unicode Odia syllables. A string like ଜଳାର୍ଣ୍ଣବ is composed of characters like [  'ଜ', 'ଳ', 'ା', 'ର',  '୍',  'ଣ', '୍',  'ଣ',  'ବ' ], therefore handling the matras and falas did the job. Here is the code in JavaScript: 

function reverseOdia(str)

{

   var reverseStr = "" ;

   var chars = [...str] ;

   var maatraas = "ାିୀୁୂୃେୈୋୌଂଁ";

   var isEnd = false ;

   syllable = "" ;

   for (let index = 0; index < str.length; index++) {

      char = str[index] ;

      nextChar = str[index+1] ;

      syllable += char ;

      if (maatraas.indexOf(nextChar) != -1 ) {

         syllable += nextChar ;

         index++ ;

         isEnd = true ;

      }

      else {

         if( nextChar == '୍') {

            isEnd = false ;

            syllable += nextChar ;

            index++ ;

         }

         else {

            isEnd = true ;

         }

      }

      if (isEnd)

      {

         reverseStr = syllable + reverseStr ;

         syllable = "" ;

      }

   }

   return reverseStr ;

}

str = "ଜଳାର୍ଣ୍ଣବ" ; // କଟକ // ଅସତ୍‌କର୍ମ // ନୃପସ୍ଥାୟକ ;

console.log(reverseOdia(str)) ;