Option.isSome<'T> Function (F#)

Returns true if the option is not None.

Namespace/Module Path: Microsoft.FSharp.Core.Option

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

// Signature:
isSome : 'T option -> bool

// Usage:
isSome option


  • option
    Type: 'Toption

    The input option.

Return Value

true if the option is not None.


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


Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2

Version Information

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

See Also


Core.Option Module (F#)

Microsoft.FSharp.Core Namespace (F#)