Funtom.Linq 0.0.4

Funtom.Linq

Funtom.Linq is a library for F# that is compatible with System.Linq.
This library makes it easier to use pipeline operators and optimizes for FSharp.Core.List<'T> and more.

Naming rules

The method names defined in System.Linq are redefined in camelCase.
For example, 'Select' becomes 'select', and 'ToList' becomes 'toList'.

Usage

In this section, I will show you how to use the System.Linq 'Where' and 'Select' method as an example.

1. When using System.Linq

   open System.Linq
   
   let xs =
     [ 0..10 ]
       .Where ((>) 5)
       .Select ((*) 2)
   

2. When using Funtom.Linq

   #r "nuget: Funtom.Linq"
   open Funtom.Linq
   
   let xs =
     [ 0..10 ]
     |> Linq.where ((>) 5)
     |> Linq.select ((*) 2)
   

Performance

Funtom.Linq is intended to be implemented in such a way that its performance is almost equal to or better than that of System.Linq.
Let's compare the performance of 'Select'.

  let xs = [ 0 .. 10000 ]
  let ys = [| 0 .. 10000 |]
  let zs = ResizeArray([| 0 .. 10000 |])
  let ss = seq { 0 .. 10000 }

  [<Benchmark>]
  member __.Fsharp_Seq_map_fslist() = xs |> Seq.map ((*) 2) |> Linq.toArray

  [<Benchmark>]
  member __.Funtom_select_fslist() = xs |> Linq.select ((*) 2) |> Linq.toArray

  [<Benchmark>]
  member __.Linq_Select_fslist() = xs.Select((*) 2).ToArray()
  
  [<Benchmark>]
  member __.Fsharp_Seq_map_array() = ys |> Seq.map ((*) 2) |> Linq.toArray

  [<Benchmark>]
  member __.Funtom_select_array() = ys |> Linq.select ((*) 2) |> Linq.toArray

  [<Benchmark>]
  member __.Linq_Select_array() = ys.Select((*) 2).ToArray()
  
  [<Benchmark>]
  member __.Fsharp_Seq_map_resizearry() = zs |> Seq.map ((*) 2) |> Linq.toArray

  [<Benchmark>]
  member __.Funtom_select_resizearry() = zs |> Linq.select ((*) 2) |> Linq.toArray

  [<Benchmark>]
  member __.Linq_Select_resizearry() = zs.Select((*) 2).ToArray()

  [<Benchmark>]
  member __.Fsharp_Seq_map_seq() = ss |> Seq.map ((*) 2) |> Linq.toArray

  [<Benchmark>]
  member __.Funtom_select_seq() = ss |> Linq.select ((*) 2) |> Linq.toArray

  [<Benchmark>]
  member __.Linq_Select_seq() = ss.Select((*) 2).ToArray()

Result: