From 9b34ecebb138e2e3060e1a1bd74f43a18e52012c Mon Sep 17 00:00:00 2001
From: gusty <1261319+gusty@users.noreply.github.com>
Date: Sun, 15 Oct 2023 06:36:24 +0200
Subject: [PATCH] + Functions for IList and IReadOnlyList

---
 src/FSharpPlus/Control/Alternative.fs      | 3 +--
 src/FSharpPlus/Extensions/IList.fs         | 8 +++++---
 src/FSharpPlus/Extensions/IReadOnlyList.fs | 9 ++++++++-
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/src/FSharpPlus/Control/Alternative.fs b/src/FSharpPlus/Control/Alternative.fs
index 9592be0d0..04ed136fa 100644
--- a/src/FSharpPlus/Control/Alternative.fs
+++ b/src/FSharpPlus/Control/Alternative.fs
@@ -1,10 +1,9 @@
-namespace FSharpPlus.Control 
-
 /// <namespacedoc>
 /// <summary>
 /// Generally internal and not useful directly - contains generic function overloaded implementations.
 /// </summary>
 /// </namespacedoc>
+namespace FSharpPlus.Control
 
 #if (!FABLE_COMPILER || FABLE_COMPILER_3) && !FABLE_COMPILER_4
 
diff --git a/src/FSharpPlus/Extensions/IList.fs b/src/FSharpPlus/Extensions/IList.fs
index f05ba64f5..6531879ec 100644
--- a/src/FSharpPlus/Extensions/IList.fs
+++ b/src/FSharpPlus/Extensions/IList.fs
@@ -1,7 +1,5 @@
 namespace FSharpPlus
 
-#if !FABLE_COMPILER
-
 /// Additional operations IList<'T>
 [<RequireQualifiedAccess>]
 module IList =
@@ -14,4 +12,8 @@ module IList =
     /// <returns>The list converted to a System.Collections.Generic.IReadOnlyList</returns>
     let toIReadOnlyList (source: IList<_>) = ReadOnlyCollection source :> IReadOnlyList<_>
 
-#endif
+    let ofArray (source: 'T[]   ) = source                 :> IList<'T>
+    let ofList  (source: 'T list) = source |> Array.ofList :> IList<'T>
+    let ofSeq   (source: seq<'T>) = source |> Array.ofSeq  :> IList<'T>
+    let map  mapping (source: IList<'T>) = Seq.map  mapping source |> Seq.toArray :> IList<'U>
+    let iter mapping (source: IList<'T>) = Seq.iter mapping source
diff --git a/src/FSharpPlus/Extensions/IReadOnlyList.fs b/src/FSharpPlus/Extensions/IReadOnlyList.fs
index b0910bf58..f975dfdc4 100644
--- a/src/FSharpPlus/Extensions/IReadOnlyList.fs
+++ b/src/FSharpPlus/Extensions/IReadOnlyList.fs
@@ -19,8 +19,15 @@ module IReadOnlyList =
         if 0 <= i && i < source.Count then
             source |> Array.ofSeq |> setNth i value |> ofArray |> Some
         else None
+    
+    let ofList (source: 'T list) = source |> Array.ofList |> IList.toIReadOnlyList
+    let ofSeq  (source: seq<'T>) = source |> Array.ofSeq  |> IList.toIReadOnlyList
+    
     #endif
 
     let tryItem i (source: IReadOnlyList<_>) =
         if 0 <= i && i < source.Count then Some source.[i]
-        else None
\ No newline at end of file
+        else None
+
+    let map mapping (source: IReadOnlyList<'T>) : IReadOnlyList<'U> = Seq.map mapping source |> Seq.toArray |> IList.toIReadOnlyList
+    let iter mapping (source: IReadOnlyList<'T>) = Seq.iter mapping source
\ No newline at end of file