Other Functions

requireTrue

Returns the specified error if the task-wrapped value is false.

'a -> Task<bool> -> Task<Result<unit, 'a>>`

requireFalse

Returns the specified error if the task-wrapped value is true.

'a -> Task<bool> -> Task<Result<unit, 'a>>`

requireSome

Converts an task-wrapped Option to a Result, using the given error if None.

'a -> Task<'b option> -> Task<Result<'b, 'a>>`

requireNone

Converts an task-wrapped Option to a Result, using the given error if Some.

'a -> Task<'b option> -> Task<Result<unit, 'a>>`

requireValueSome

Converts an task-wrapped ValueOption to a Result, using the given error if ValueNone.

'a -> Task<'b voption> -> Task<Result<'b, 'a>>

requireValueNone

Converts an task-wrapped ValueOption to a Result, using the given error if ValueSome.

'a -> Task<'b voption> -> Task<Result<unit, 'a>>

requireEqual

Returns Ok if the task-wrapped value and the provided value are equal, or the specified error if not. Same as requireEqualTo, but with a parameter order that fits normal function application better than piping.

'a -> Task<'a> -> 'b -> Task<Result<unit, 'b>>

requireEqualTo

Returns Ok if the task-wrapped value and the provided value are equal, or the specified error if not. Same as requireEqual, but with a parameter order that fits piping better than normal function application.

'a -> 'b -> Task<'a> -> Task<Result<unit, 'b>>

requireEmpty

Returns Ok if the task-wrapped sequence is empty, or the specified error if not.

'a -> Task<'b> -> Task<Result<unit, 'a>>

requireNotEmpty

Returns Ok if the task-wrapped sequence is non-empty, or the specified error if not.

'a -> Task<'b> -> Task<Result<unit, 'a>>

requireHead

Returns the first item of the sequence if it exists, or the specified error if the sequence is empty

'a -> Task<'b> -> Task<Result<'c, 'a>>

require

Returns the provided task-wrapped result if it is Ok and the predicate is true, or if the task-wrapped result is Error. If the predicate is false, returns a new task-wrapped Error result with the error value.

('a -> bool) -> 'b -> Task<Result<'a,'b>> -> Task<Result<'a,'b>>

setError

Replaces an error value of an task-wrapped result with a custom error value

'a -> Task<Result<'b, 'c>> -> Task<Result<'b, 'a>>

withError

Replaces a unit error value of an task-wrapped result with a custom error value. Safer than setError since you're not losing any information.

'a -> Task<Result<'b, unit>> -> Task<Result<'b, 'a>>

defaultValue

Extracts the contained value of an task-wrapped result if Ok, otherwise uses the provided value.

'a -> Task<Result<'a, 'b>> -> Task<'a>

defaultWith

Extracts the contained value of an task-wrapped result if Ok, otherwise evaluates the given function and uses the result.

(unit -> 'a) -> Task<Result<'a, 'b>> -> Task<'a>

ignoreError

Same as defaultValue for a result where the Ok value is unit. The name describes better what is actually happening in this case.

Task<Result<unit, 'a>> -> Task<unit>

tee

If the task-wrapped result is Ok, executes the function on the Ok value. Passes through the input value unchanged.

('a -> unit) -> Task<Result<'a, 'b>> -> Task<Result<'a, 'b>>

teeError

If the task-wrapped result is Error, executes the function on the Error value. Passes through the input value unchanged.

('a -> unit) -> Task<Result<'b, 'a>> -> Task<Result<'b, 'a>>

teeIf

If the task-wrapped result is Ok and the predicate returns true for the wrapped value, executes the function on the Ok value. Passes through the input value unchanged.

('a -> bool) -> ('a -> unit) -> Task<Result<'a, 'b>> -> Task<Result<'a, 'b>>

teeErrorIf

If the task-wrapped result is Error and the predicate returns true for the wrapped value, executes the function on the Error value. Passes through the input value unchanged.

('a -> bool) -> ('a -> unit) -> Task<Result<'b, 'a>> -> Task<Result<'b, 'a>>

sequenceTask

Converts a Result<Task<'a>, 'b> to Task<Result<'a, 'b>>.

Result<Task<'a>, 'b> -> Task<Result<'a, 'b>>