Can I format a number before it is rendered in

Question

I am rendering a node in Flutter app something like:

We have total ${_summary[\'bookCount\']} books. 

_summ

Answer 1

There is a Flutter package that allows you to format text input with predefined patterns. First add the following line to the Dart dependencies: pubspec.yaml file:

    pattern_formatter: ^1.0.2```
then import it in your dart code
    import 'package:pattern_formatter/pattern_formatter.dart';

Example: Thousand group
    TextField(
      keyboardType: TextInputType.number,
      inputFormatters: [
      ThousandsFormatter()
    ],
   )

Decimal Number
    TextField(
     keyboardType: TextInputType.number,
     inputFormatters: [
     ThousandsFormatter(allowFraction: true)
  ],
 )

Card number grouping 

    TextField(
      keyboardType: TextInputType.number,
      inputFormatters: [
      CreditCardFormatter(),
    ],
   )

Date format

    TextField(
      keyboardType: TextInputType.number,
      inputFormatters: [
      DateInputFormatter(),
  ],
)