some 1.2.3

Some / Maybe / Option / Result / Nullable, like Haskel Maybe, Can avoid semantic confusion caused by returning null when returning a value

1.2.3

Rewritten implementation

Fix bug: eq

• Some(1) != 1

now

• Some(1) == 1

Add eq test

1.2.2

remove const None
Fix bug: const None

1.2.1

Fix bug(null.dart): defaultVal and defaultValFn when Some while return None

1.2.0

Fix bug: defaultVal and defaultValFn when Some while return None

1.1.1

const None

1.1.0

Add const constructor

1.0.1

Add example

1.0.0

Create this