Opt<T extends Object> typedef

Opt<T extends Object> = Option<T>

Compact alias for Option.

Option

A generic Option type that represents either a Val value or a Nil (absence of value).

Use Option to make presence and absence explicit without throwing exceptions or hiding absence behind null.

• Val means a value is present.
• Nil means no value is present.
• T is non-nullable; Val cannot wrap null. Use Nil to represent absence.

Example:

final option = Val<int>(42);

option.fold(
  onVal: (value) => print('Value: $value'),
  onNil: () => print('No value'),
);

final doubled = option.next((value) => Val(value * 2));

switch (option) {
  case Val<int>(:final value):
    print('Value: $value');
  case Nil<int>():
    print('No value');
}

Implementation

typedef Opt<T extends Object> = Option<T>;