param 0.0.1

Simplifies changing/nullifying parameters for copyWith methods.

Simplifies changing/nullifying parameters for copyWith methods

Examples

Non-nullable parameter

import 'package:param/param.dart';

class Foo {
  final String value;

  Foo(this.value);

  Foo copyWith({Param<String>? value}) =>
      Foo(Param.apply(value, this.value));
}

You can:

• Leave the value as-is by omitting the param (or passing null, it is the same).
• Change the value with a param value of Param.set('new value')

Nullable parameter

class NullableFoo {
  final String? value;

  NullableFoo(this.value);

  NullableFoo copyWith({NullableParam<String?>? value}) =>
      NullableFoo(NullableParam.apply(value, this.value));
}

NullableParam is more flexible, you can:

• Leave the value as-is by omitting the nullable param (or passing null, it is the same)
• Change the value with a nullable param value of NullableParam.set('new value')
• Set the value to null with a nullable param value of NullableParam.nullify()