some

Description:

some

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



Usage #
Import #
import 'package:some/index.dart'; // import all
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Create #
Maybe<int> some = Some(1);
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Maybe<int> none = None();
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Switch (dart > 3.0.0) #
Maybe<int> some = Some(1);

var a = switch (some) {
Some(v: var v) => v,
null => 0
};
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Check has value #
some.isSome
none.isNone
some.has
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Get value #
if(some.has) {
some.val!
}
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Monadic #
some.map((v) => 'some');
some.then((v) => 'some');
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some.flatMap((v) => Some('some'));
some.andThen((v) => Some('some'));
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Logical #
some.and(Some('some'));
some.andThen((v) => Some('some'));
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some.or(Some('some'));
some.orElse(() => Some('some'));
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some.xor(Some('some'));
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Flatten #
someSome.flatten();
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Pattern matching #
some.when(some: (v) => 'some', none: () => 'none');
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some.some((v) => 'some');
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none.none(() => 'none');
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none.defaultVal('none');
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none.defaultValFn(() => 'none');
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