removeInsignificantZeros static method

String removeInsignificantZeros(String str)

Removes any zeros at the end of a number string that follow a decimal point (except for one that immediately follows the decimal point).

Implementation

static String removeInsignificantZeros(String str) {
  if (str.isNotEmpty != true) return str;
  final dotIndex = str.indexOf('.');
  if (dotIndex == -1) return str;
  final eIndex = str.toLowerCase().indexOf('e');
  final decimalCount =
      eIndex == -1 ? str.length - dotIndex - 1 : eIndex - dotIndex - 1;
  if (decimalCount < 2) return str;
  final lastDigitIndex = eIndex == -1 ? str.length - 1 : eIndex - 1;
  int endIndex;
  for (endIndex = lastDigitIndex; endIndex > dotIndex + 1; endIndex--) {
    if (str.substring(endIndex, endIndex + 1) != '0') break;
  }
  return eIndex == -1
      ? str.substring(0, endIndex + 1)
      : '${str.substring(0, endIndex + 1)}${str.substring(eIndex)}';
}