This is a Dart implementation of the Money pattern, as described in [Fowler PoEAA]:
A large proportion of the computers in this world manipulate money, so it’s always puzzled me that money isn’t actually a first class data type in any mainstream programming language. The lack of a type causes problems, the most obvious surrounding currencies. If all your calculations are done in a single currency, this isn’t a huge problem, but once you involve multiple currencies you want to avoid adding your dollars to your yen without taking the currency differences into account. The more subtle problem is with rounding. Monetary calculations are often rounded to the smallest currency unit. When you do this it’s easy to lose pennies (or your local equivalent) because of rounding errors.
— Fowler, M., D. Rice, M. Foemmel, E. Hieatt, R. Mee, and R. Stafford, Patterns of Enterprise Application Architecture, Addison-Wesley, 2002.
This package provides the value type EmailAddress to have a typed
representation of the e-mail address with the encapsulated validation.
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Install the package as a dependency, running the command in the shell:
dart pub add money
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Import the library:
import 'package:money/money.dart';