Method Select

Select<T, TResult>(Maybe<T>, Func<T, Maybe<TResult>>)

Converts a Maybe<T> to a Maybe{TResult} using the function provided.

Declaration

public static Maybe<TResult> Select<T, TResult>(this Maybe<T> maybe, Func<T, Maybe<TResult>> predicate)

Parameters

Type	Name	Description
Maybe<T>	maybe	The maybe to convert.
Func<T, Maybe<TResult>>	predicate	A function that converts the value of maybe.

Returns

Type	Description
Maybe<TResult>	A Maybe{T} instance that is either nothing, or the result of the predicate function.

Type Parameters

Name	Description
T	The type of value contained in the maybe instance.
TResult	The type of value in the returned Maybe<T> instance.

Remarks

If maybe is nothing then an empty instance of Maybe{TResult} is returned, otherwise the predicate function is used to calculate the return value.

Exceptions

Type	Condition
System.ArgumentNullException	Thrown if predicate is null.

Select<T, TResult>(Maybe<T>, Func<T, TResult>)

Converts a Maybe<T> to a Maybe{TResult} using the function provided.

Declaration

public static Maybe<TResult> Select<T, TResult>(this Maybe<T> maybe, Func<T, TResult> predicate)

Parameters

Type	Name	Description
Maybe<T>	maybe	The maybe to convert.
Func<T, TResult>	predicate	A function that converts the value of maybe to a value of TResult.

Returns

Type	Description
Maybe<TResult>	A Maybe{T} instance that is either nothing, or the result of the predicate function.

Type Parameters

Name	Description
T	The type of value contained in the maybe instance.
TResult	The type of value in the returned Maybe<T> instance.

Exceptions

Type	Condition
System.ArgumentNullException	Thrown if predicate is null.

Select<T, TResult>(IEnumerable<Maybe<T>>, Func<T, Maybe<TResult>>)

Converts an of Maybe<T> values to a set of Maybe{TResult} values.

Declaration

public static IEnumerable<Maybe<TResult>> Select<T, TResult>(this IEnumerable<Maybe<T>> source, Func<T, Maybe<TResult>> predicate)

Parameters

Type	Name	Description
IEnumerable<Maybe<T>>	source	The to operate on.
Func<T, Maybe<TResult>>	predicate	A function that converts a {T} value to a Maybe{TResult}.

Returns

Type	Description
IEnumerable<Maybe<TResult>>	A set of Maybe{TResult} values.

Type Parameters

Name	Description
T	The type of value contained with the Maybe<T> instances in the source argument.
TResult	The type of value contained in the Maybe<T> instances returned.

Remarks

If source is null then an empty set is returned.

Exceptions

Type	Condition
System.ArgumentNullException	Thrown if predicate is null.