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Showing content from https://dotnet.github.io/dotNext/api/DotNext.Optional.html below:

Class Optional | .NEXT

Various extension and factory methods for constructing optional value.

public static class Optional

Returns the second value if the first is empty.

public static ref readonly Optional<T> Coalesce<T>(this in Optional<T> first, in Optional<T> second)

The first optional value.

The second optional value.

The second value if the first is empty; otherwise, the first value.

Type of value.

If a value is present, apply the provided mapping function to it, and if the result is non-null, return an Optional describing the result. Otherwise, returns None.

public static Task<Optional<TOutput>> Convert<TInput, TOutput>(this Task<Optional<TInput>> task, Converter<TInput, TOutput> converter)

The task containing Optional value.

A mapping function to be applied to the value, if present.

An Optional describing the result of applying a mapping function to the value of this Optional, if a value is present, otherwise None.

The type of stored in the Optional container.

The type of the mapping function result.

If a value is present, apply the provided mapping function to it, and if the result is non-null, return an Optional describing the result. Otherwise, returns None.

public static Task<Optional<TOutput>> Convert<TInput, TOutput>(this Task<Optional<TInput>> task, Func<TInput, CancellationToken, Task<TOutput>> converter, CancellationToken token = default)

The task containing Optional value.

A mapping function to be applied to the value, if present.

The token that can be used to cancel the operation.

An Optional describing the result of applying a mapping function to the value of this Optional, if a value is present, otherwise None.

The type of stored in the Optional container.

The type of the mapping function result.

Flattens the nested optional value.

public static Optional<T> Flatten<T>(this in Optional<Optional<T>> optional)

Flattened value.

The type of the underlying value.

Returns a task that contains unwrapped value; or exception if Optional<T> has no value.

public static Task<T> Flatten<T>(this Task<Optional<T>> task)

The task representing optional value.

The task containing a value of type T; or the exception if Optional<T> has no value.

The type of the value.

Returns the underlying type argument of the specified optional type.

public static Type? GetUnderlyingType(Type optionalType)

Optional type.

Underlying type argument of the optional type; otherwise, null.

If a value is present, and the value matches the given predicate, return an Optional describing the value, otherwise return an empty Optional.

public static Task<Optional<T>> If<T>(this Task<Optional<T>> task, Predicate<T> condition)

The task returning optional value.

A predicate to apply to the value, if present.

An Optional describing the value of this Optional if a value is present and the value matches the given predicate, otherwise an empty Optional.

Type of the value.

Indicates that specified type is optional type.

public static bool IsOptional(this Type optionalType)

The type to check.

true, if specified type is optional type; otherwise, false.

Returns empty value.

public static Optional<T> None<T>()

The empty value.

The type of empty result.

Wraps null value to Optional<T> container.

public static Optional<T> Null<T>() where T : class?

The reference type.

If a value is present, returns the value, otherwise return default value.

public static Task<T?> OrDefault<T>(this Task<Optional<T>> task)

The task returning optional value.

The value stored in the container, if present, otherwise default value.

Type of the value.

Returns the value if present; otherwise invoke delegate.

public static Task<T> OrInvoke<T>(this Task<Optional<T>> task, Func<T> defaultFunc)

The task returning optional value.

A delegate to be invoked if value is not present.

The value, if present, otherwise returned from delegate.

Type of the value.

If a value is present, returns the value, otherwise null.

public static T? OrNull<T>(this in Optional<T> value) where T : struct

Optional value.

Nullable value.

Value type.

If a value is present, returns the value, otherwise null.

public static Task<T?> OrNull<T>(this Task<Optional<T>> task) where T : struct

The task returning optional value.

Nullable value.

The type of the value.

If a value is present, returns the value, otherwise throw exception.

public static Task<T> OrThrow<T, TException>(this Task<Optional<T>> task) where TException : Exception, new()

The task returning optional value.

The value, if present.

Type of the value.

Type of exception to throw.

If a value is present, returns the value, otherwise throw exception.

public static Task<T> OrThrow<T, TException>(this Task<Optional<T>> task, Func<TException> exceptionFactory) where TException : Exception

The task returning optional value.

Exception factory.

The value, if present.

Type of the value.

Type of exception to throw.

Returns the value if present; otherwise return default value.

public static Task<T?> Or<T>(this Task<Optional<T>> task, T? defaultValue)

The task returning optional value.

The value to be returned if there is no value present.

The value, if present, otherwise default.

The type of the value.

Wraps the value to Optional<T> container.

public static Optional<T> Some<T>(T value)

The value to be wrapped.

The optional container.

The type of the value.

Constructs optional value from nullable value type.

public static Optional<T> ToOptional<T>(this in T? value) where T : struct

The value to convert.

The value wrapped into Optional container.

Type of value.

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