+ Functions for IList and IReadOnlyList

Author: gusty

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
 

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

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
+        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