Observable.filter<'T> Function (F#)

  • Article

Returns an observable which filters the observations of the source by the given function. The observable will see only those observations for which the predicate returns true. The predicate is executed once for each subscribed observer. The returned object also propagates error observations 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.filter : ('T -> bool) -> IObservable<'T> -> IObservable<'T>

// Usage:
Observable.filter predicate source

Parameters

  • predicate
    Type: 'T -> bool

    The function to apply to observations to determine if it should be kept.

  • source
    Type: IObservable<'T>

    The input Observable.

Return Value

An Observable that filters observations based on filter.

Remarks

This function is named Filter 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#)