Esta clase contiene un metodo estático para formatear numeros extensos a strings legibles de forma amigable con los usuarios, Ej: 143.790 -> 143.7K, 2.250.000 -> 2.2M

legible_format.dart

  Map<int, String> _shortNotationNumbers = {
    1: 'K',
    2: 'M',
    3: 'B',
    4: 'T'
  };


  /// @author Sebastian Morales;
  class LegibleFormat{

    /// @param double [number].
    /// @return [String].
    static String readableNumber(double number) {
      if(number<1000) return number.toString().split('.')[0];

      String strNumber = '$number';
      String integerFragment = strNumber.split('.')[0];
      int divisions = integerFragment.length ~/3;
      int rest = integerFragment.length %3;
      String decimal = integerFragment.substring(integerFragment.length-divisions*3, (integerFragment.length-divisions*3)+1 );

      if(decimal == '0' && rest ==0) return '${integerFragment.substring(0, integerFragment.length-(divisions-1)*3)}${_shortNotationNumbers[divisions]}'; 
      if( rest ==0){ 
        String decimalVariant = integerFragment.substring(integerFragment.length-((divisions-1)*3), (integerFragment.length-((divisions-1)*3))+1 );
        return '${integerFragment.substring(0, integerFragment.length-(divisions-1)*3)}.$decimalVariant${_shortNotationNumbers[divisions]}'; 
      }

      return (decimal == '0' && rest !=0)
          ? '${integerFragment.substring(0, integerFragment.length-divisions*3)}${_shortNotationNumbers[divisions]}'
          : '${integerFragment.substring(0, integerFragment.length-divisions*3)}.$decimal${_shortNotationNumbers[divisions]}';
    }
  }