The playground about functional composition and pipeline operation in F#

fsharp-playground_01_functional-composition-and-pipeline-operation.fsx

// Playground
// ref. http://msdn.microsoft.com/ja-jp/library/dd233229.aspx
//
// All results are... 'val it : string = "abcdef"'
//

//  Bacward pipeline operators only
['a'..'f'] |> List.map string |> List.reduce (+)

//  With a composition operator
['a'..'f'] |> ( List.map string >> List.reduce (+) )

//  With a backward composition operator
['a'..'f'] |> ( List.reduce (+) << List.map string )

//  No more backward pipline operators
( List.map string >> List.reduce (+) ) ['a'..'f']
( List.reduce (+) << List.map string ) ['a'..'f']

//  Normal pipeline operators
List.reduce (+) <| List.map string ['a'..'f']