task_option
library
Classes
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TaskOption<A>
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Represents a Task that resolves to an Option.
Useful for creating async operations that might return nothing.
Functions
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alt<A>(TaskOption<A> onNone())
→ TaskOption<A> Function(TaskOption<A> taskOption)
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If the TaskOption resolves to None, then the alternative TaskOption
will be used.
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chainNullable<A>(TaskOption<A?> taskOption)
→ TaskOption<A>
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A chainable fromNullable variant that flattens nullable values into an
Option.
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chainNullableK<A, B>(B? f(A a))
→ TaskOption<B> Function(TaskOption<A> value)
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A chainable fromNullable variant that transforms the given TaskOption
into a nullable value, then flattens the result.
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chainTryCatchK<A, B>(FutureOr<B> task(A value))
→ TaskOption<B> Function(TaskOption<A> taskOption)
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A chainable variant of tryCatchK, that unwraps the given TaskOption.
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delay<A>(Duration duration)
→ TaskOption<A> Function(TaskOption<A> taskOption)
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Do<A>(DoFunction<A> f)
→ TaskOption<A>
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filter<A>(bool predicate(A value))
→ TaskOption<A> Function(TaskOption<A> taskOption)
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Conditionally transform the TaskOption to a None, using the given
predicate.
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flatMap<A, B>(TaskOption<B> f(A value))
→ TaskOption<B> Function(TaskOption<A> taskOption)
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Transform the given TaskOption into a new TaskOption, if it resolves to
a Some value.
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flatMapFirst<A>(TaskOption f(A value))
→ TaskOption<A> Function(TaskOption<A> taskOption)
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Similar to flatMap, except Some values are discarded.
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flatMapTask<A, B>(Task<B> f(A value))
→ TaskOption<B> Function(TaskOption<A> taskOption)
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flatMapTuple2<A, A2>(TaskOption<A2> f(A a))
→ TaskOption Function(TaskOption<A> o)
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A variant of flatMap that appends the result to a tuple.
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flatMapTuple3<A, A2, A3>(TaskOption<A3> f(dynamic a))
→ TaskOption<Tuple3<A, A2, A3>> Function(TaskOption o)
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A variant of flatMap that appends the result to a tuple.
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fold<A, B>(B onNone(), B onSome(A value))
→ Task<B> Function(TaskOption<A> taskOption)
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Transforms the TaskOption into a Task, using the given
onNone and onSome
callbacks.
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fromEither<L, R>(Either<L, R> either)
→ TaskOption<R>
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Returns a TaskOption that resolves to an Option from the given Either.
Left values become None, Right values are wrapped in Some.
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fromNullable<A>(A? a)
→ TaskOption<A>
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Create a TaskOption from a value that could be
null. If it is not null,
then it will resolve to Some. null values become None.
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fromNullableK<A, B>(B? f(A a))
→ TaskOption<B> Function(A value)
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A fromNullable variant that allows for external values to be passed in.
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fromNullableWith<A>()
→ TaskOption<A> Function(A? value)
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A fromNullable variant that enforces the input type.
Useful for function composition.
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fromOption<A>(Option<A> option)
→ TaskOption<A>
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Returns a TaskOption that resolves to the given Option.
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fromPredicate<A>(A value, bool predicate(A value))
→ TaskOption<A>
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Returns a Some or None if the predicate returns
true or false
respectively.
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fromPredicateK<A>(bool predicate(A value))
→ TaskOption<A> Function(A a)
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Returns a Some or None if the predicate returns
true or false
respectively.
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fromTask<A>(Task<A> task)
→ TaskOption<A>
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Wraps the value from a Task in a Some.
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getOrElse<A>(A orElse())
→ Task<A> Function(TaskOption<A> taskOption)
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Transforms the TaskOption into a Task, by unwrapping the Some value or
using the
orElse value if it resolves to None.
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map<A, B>(B f(A value))
→ TaskOption<B> Function(TaskOption<A> taskOption)
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Transforms a TaskOption value if it resolves to Some.
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none<A>()
→ TaskOption<A>
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Returns a TaskOption that resolves to None.
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orElse<A>(TaskOption<A> task)
→ TaskOption<A> Function(TaskOption<A> taskOption)
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A variant of alt, which accepts the replacement TaskOption directly.
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pure<A, B>(B b)
→ TaskOption<B> Function(TaskOption<A> taskOption)
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Replaces the TaskOption with one that resolves to a Some wrapping the
given value.
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sequence<A>(Iterable<TaskOption<A>> tasks)
→ TaskOption<IList<A>>
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sequenceSeq<A>(Iterable<TaskOption<A>> tasks)
→ TaskOption<IList<A>>
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some<A>(A a)
→ TaskOption<A>
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Returns a TaskOption that resolves to Some.
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tap<A>(FutureOr<void> f(A value))
→ TaskOption<A> Function(TaskOption<A> taskOption)
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Perform a side effect if the TaskOption is a Some.
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tryCatch<A>(Lazy<FutureOr<A>> task)
→ TaskOption<A>
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Runs the given task, and wraps the result with Some.
If it throws and error, it will return None.
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tryCatchK<A, B>(FutureOr<B> task(A value))
→ TaskOption<B> Function(A value)
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A variant of tryCatch, that allows external values to be passed in.
