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

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


Returns true if the option is None.

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

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

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

// Usage:
isNone option


Type: 'T option

The input option.

true if the option is None.

This function is named IsNone 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

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

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