Core.Option Module (F#)
Basic operations on options.
Namespace/Module Path: Microsoft.FSharp.Core
Assembly: FSharp.Core (in FSharp.Core.dll)
module Option
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. |
