some 1.2.2

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

Some / Maybe / Option / Result / Nullable

Can avoid semantic confusion caused by returning null when returning a value

like Haskel Maybe

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Usage

Import

import 'package:some/index.dart'; // import all

import 'package:some/maybe.dart'; // only class Maybe
import 'package:some/some.dart'; // only class Some
import 'package:some/none.dart'; // only class None

import 'package:some/null.dart'; // only no null function

Create

Maybe<int> some = Some(1);

Maybe<int> none = None();

Maybe<int> some = Maybe(1);

Maybe<int> some = Maybe.Some(1);

Maybe<int> none = Maybe.None();

GetValue

if(some.has) {
    some.val
}

Pattern matching

if(some is Some) {}

if(some is Some<int>) {}

if(some is None) {}

some.when(some: (v) => 'some', none: () => 'none');

some.some((v) => 'some');

none.none(() => 'none');

none.defaultVal('none');

none.defaultValFn(() => 'none');