FsToolkit.ErrorHandling
  • README
  • FsToolkit.ErrorHandling
    • Result
      • apply
      • bind
      • check
      • Computation Expression
      • either Functions
      • fold
      • ignore
      • map
      • map2
      • map3
      • mapError
      • Operators
      • orElse Functions
      • Other Functions
      • require Functions
      • tee Functions
      • tryCreate
      • zip
      • zipError
      • Lists
        • traverseResultM
        • sequenceResultM
        • traverseResultA
        • sequenceResultA
      • Sequences
        • traverseResultM
        • sequenceResultM
        • traverseResultA
        • sequenceResultA
      • Transforms
        • ofChoice
    • Option
      • bind
      • bindNull
      • Computation Expression
      • either
      • map
      • map2
      • map3
      • sequenceAsync
      • sequenceResult
      • sequenceTask
      • sequenceTaskResult
      • tee Functions
      • traverseAsync
      • traverseResult
      • traverseTask
      • traverseTaskResult
      • zip
      • Lists
        • traverseOptionM
        • sequenceOptionM
        • traverseVOptionM
        • sequenceVOptionM
      • Sequences
        • traverseOptionM
        • sequenceOptionM
        • traverseVOptionM
        • sequenceVOptionM
      • Transforms
        • ofNull
        • ofPair
        • ofResult
        • ofValueOption
        • toValueOption
    • ResultOption
      • apply
      • bind
      • Computation Expression
      • ignore
      • map
      • map2
      • map3
      • mapError
      • Operators
      • zip
      • zipError
      • Transforms
        • ofChoice
        • ofOption
        • ofResult
    • AsyncResult
      • apply
      • bind
      • check
      • Computation Expression
      • error
      • foldResult
      • ignore
      • map
      • map2
      • map3
      • mapError
      • Operators
      • Other Functions
      • zip
      • zipError
      • List
        • traverseAsyncResultM
        • sequenceAsyncResultM
        • traverseAsyncResultA
        • sequenceAsyncResultA
      • Sequences
        • traverseAsyncResultM
        • sequenceAsyncResultM
        • traverseAsyncResultA
        • sequenceAsyncResultA
      • Transforms
        • ofAsync
        • ofResult
        • ofTask
        • ofTaskAction
    • AsyncOption
      • apply
      • bind
      • Computation Expression
      • either
      • map
      • orElse Functions
      • Other Functions
    • AsyncResultOption
      • apply
      • bind
      • Computation Expression
      • ignore
      • map
      • map2
      • map3
      • Operators
      • Transforms
        • ofAsyncOption
        • ofAsyncResult
        • ofOption
        • ofResult
    • Task
      • apply
      • bind
      • bindV
      • catch
      • Computation Expression
      • ignore
      • map
      • mapV
      • map2
      • map3
      • zip
      • Transforms
        • ofUnit
    • TaskOption
      • apply
      • bind
      • Computation Expression
      • either
      • map
      • Other Functions
      • zip
    • TaskResult
      • apply
      • bind
      • check
      • catch
      • Computation Expression
      • ignore
      • map
      • map2
      • map3
      • mapError
      • Operators
      • Other Functions
      • error
      • zip
      • zipError
      • Lists
        • traverseTaskResultM
        • sequenceTaskResultM
        • traverseTaskResultA
        • sequenceTaskResultA
      • Transforms
        • ofAsync
        • ofResult
        • ofTask
    • TaskResultOption
      • apply
      • bind
      • Computation Expression
      • ignore
      • map
      • map2
      • map3
      • Operators
    • Validation
      • apply
      • Computation Expression
      • error
      • map
      • map2
      • map3
      • mapError
      • mapErrors
      • Operators
      • zip
      • Transforms
        • ofChoice
        • ofResult
    • AsyncValidation
      • apply
      • Computation Expression
      • error
      • map
      • map2
      • map3
      • mapError
      • mapErrors
      • Operators
      • zip
      • Transforms
        • ofChoice
        • ofResult
    • TaskValidation
      • apply
      • Computation Expression
      • error
      • map
      • map2
      • map3
      • mapError
      • mapErrors
      • Operators
      • zip
      • Transforms
        • ofChoice
        • ofResult
  • FsToolkit.ErrorHandling.AsyncSeq
    • AsyncSeq
      • Computation Expression
  • FsToolkit.ErrorHandling.IcedTasks
    • CancellableTaskResult
      • apply
      • bind
      • Computation Expression
      • getCancellationToken
      • map
      • Operators
      • Other Functions
      • zip
      • parallelZip
    • CancellableTaskValidation
      • apply
      • bind
      • Computation Expression
      • error
      • getCancellationToken
      • map
      • map2
      • map3
      • mapError
      • mapErrors
      • Operators
      • zip
      • parallelZip
      • Transforms
        • ofChoice
        • ofResult
  • FsToolkit.ErrorHandling.JobResult
    • Job
      • apply
      • map2
      • map3
      • singleton
      • zip
    • JobOption
      • apply
      • bind
      • ce
      • either
      • map
    • JobResult
      • apply
      • bind
      • catch
      • Computation Expression
      • error
      • fromTask
      • fromUnitTask
      • ignore
      • map
      • map2
      • map3
      • mapError
      • Operators
      • Other Functions
      • zip
      • zipError
      • Lists
        • traverseJobResultM
        • sequenceJobResultM
        • traverseJobResultA
        • sequenceJobResultA
      • Transforms
        • ofAsync
        • ofJob
        • ofResult
        • fromTask
        • fromUnitTask
    • JobResultOption
      • apply
      • bind
      • Computation Expression
      • ignore
      • map
      • map2
      • map3
  • General Docs
    • Bind Mappings
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  • Function Signature
  • Examples
  • Example 1
  • Example 2
  1. FsToolkit.ErrorHandling
  2. Option

either

Namespace: FsToolkit.ErrorHandling

Function Signature

Provide two functions to execute depending on the value of the option. If the option is Some, the first function will be executed. If the option is None, the second function will be executed.

('T-> 'output) -> (unit -> 'output) -> 'T option -> 'output

Examples

Example 1

Option.either (fun x -> x * 2) (fun () -> 0) (Some 5)

// 10

Example 2

Option.either (fun x -> x * 2) (fun () -> 0) None

// 0
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Last updated 1 year ago