Core.Option Module (F#)

Basic operations on options.

Namespace/Module Path: Microsoft.FSharp.Core

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

module Option

Remarks

For an overview of options in F#, see Options (F#).

Value	Description
bind : ('T -> 'U option) -> 'T option -> 'U option	Invokes a function on an optional value that itself yields an option.
count : 'T option -> int	Evaluates the equivalent of Set.count for an option.
exists : ('T -> bool) -> 'T option -> bool	Evaluates the equivalent of List.exists for an option.
fold : ('State -> 'T -> 'State) -> 'State -> 'T option -> 'State	Evaluates the equivalent of List.fold for an option.
foldBack : ('T -> 'State -> 'State) -> 'T option -> 'State -> 'State	Performs the equivalent of the List.foldBack operation on an option.
forall : ('T -> bool) -> 'T option -> bool	Evaluates the equivalent of List.forall for an option type.
get : 'T option -> 'T	Gets the value associated with the option.
isNone : 'T option -> bool	Returns true if the option is None.
isSome : 'T option -> bool	Returns true if the option is not None.
iter : ('T -> unit) -> 'T option -> unit	Executes a function for an option value.
map : ('T -> 'U) -> 'T option -> 'U option	Transforms an option value by using a specified mapping function.
toArray : 'T option -> 'T []	Convert the option to an array of length 0 or 1.
toList : 'T option -> 'T list	Convert the option to a list of length 0 or 1.

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

F# Core Library Versions

Supported in: 2.0, 4.0, Portable