Observable.choose<'T,'U> Function (F#)

  • Article

Returns an observable which chooses a projection of observations from the source using the given function. The returned object will trigger observations for which the splitter returns a Some value. The returned object also propagates all errors arising from the source and completes when the source completes.

Namespace/Module Path: Microsoft.FSharp.Control.Observable

Assembly: FSharp.Core (in FSharp.Core.dll)

// Signature:
Observable.choose : ('T -> 'U option) -> IObservable<'T> -> IObservable<'U>

// Usage:
Observable.choose chooser source

Parameters

  • chooser
    Type: 'T -> 'U option

    The function that returns Some for observations to be propagated and None for observations to ignore.

  • source
    Type: IObservable<'T>

    The input Observable.

Return Value

An Observable that only propagates some of the observations from the source.

Remarks

This function is named Choose in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.

Platforms

Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2

Version Information

F# Runtime

Supported in: 2.0, 4.0

Silverlight

Supported in: 3

See Also

Reference

Control.Observable Module (F#)

Microsoft.FSharp.Control Namespace (F#)