Other Functions

requireTrue

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

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

requireFalse

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

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

requireSome

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

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

requireNone

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

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

requireEqual

Returns Ok if the async-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 -> Async<'a> -> 'b -> Async<Result<unit, 'b>>

requireEqualTo

Returns Ok if the async-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 -> Async<'a> -> Async<Result<unit, 'b>>

requireEmpty

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

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

requireNotEmpty

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

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

requireHead

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

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

setError

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

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

withError

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

'a -> Async<Result<'b, uni>t> -> Async<Result<'b, 'a>>

defaultValue

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

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

defaultWith

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

(unit -> 'a) -> Async<Result<'a, 'b>> -> Async<'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.

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

tee

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

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

teeError

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

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

teeIf

If the async-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) -> Async<Result<'a, 'b>> -> Async<Result<'a, 'b>>

teeErrorIf

If the async-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) -> Async<Result<'b, 'a>> -> Async<Result<'b, 'a>>