Number Formatting for large integer numbers in Javascript -


i know there in-build function in javascript tolocalstring() achieve number formatting. question purely learning , logic understanding.

i have function in javascript formats given number in indian number formatting standards (eg: 1,234 | 12,21,123 | etc)

code 

function formatter(input) {      var inputstr = input.tostring(), l = inputstr.length;     var c = 1, f = 0;      console.log(l);      (var x=l-1; x>=0; x--) {          if (x === 0) {             continue;         }          if (c === 3 && f === 0) {             inputstr = inputstr.substring(0, x) + ',' + inputstr.substring(x);             f = 1;             c = 0;         } else if (c % 2 === 0 && f === 1) {             inputstr = inputstr.substring(0, x) + ',' + inputstr.substring(x);             c = 0;         }          c++;     }      return inputstr; }

now works part (as far have test, point out bugs if spot any). question how handle large number in this, i.e. how handle values greater 9007199254740991.


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