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Union constructors can be used as functions

Union constructors can be used as functions

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type Ast
  = Identifier of string
  | Number of int

let num f x = f x

num Number 1
union case Ast.Identifier: string -> Ast
Multiple items
val string : value:'T -> string

Full name: Microsoft.FSharp.Core.Operators.string

--------------------
type string = System.String

Full name: Microsoft.FSharp.Core.string
union case Ast.Number: int -> Ast
Multiple items
val int : value:'T -> int (requires member op_Explicit)

Full name: Microsoft.FSharp.Core.Operators.int

--------------------
type int = int32

Full name: Microsoft.FSharp.Core.int

--------------------
type int<'Measure> = int

Full name: Microsoft.FSharp.Core.int<_>
val num : f:('a -> 'b) -> x:'a -> 'b

Full name: Script.num
val f : ('a -> 'b)
val x : 'a
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Link:http://fssnip.net/31
Posted:6 years ago
Author:fholm
Tags: unions , functions