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Operators.defaultArg<'T> Function (F#)

Den Delimarsky|Last Updated: 8/18/2017
1 Contributor

Used to specify a default value for an optional argument in the implementation of a function.

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

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


// Signature:
defaultArg : 'T option -> 'T -> 'T

// Usage:
defaultArg arg defaultValue


arg Type: 'T option

An option representing the argument.

defaultValue Type: 'T

The default value of the argument.

Return Value

The argument value. If it is None, the defaultValue is returned.


This function is named DefaultArg in compiled assemblies. If you are accessing the function from a .NET 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.Operators Module (F#)

Microsoft.FSharp.Core Namespace (F#)

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