+ Functions for IList and IReadOnlyList

fsprojects · Oct 15, 2023 · c10bd73 · c10bd73
1 parent 466d3e1
commit c10bd73
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Showing 2 changed files with 14 additions and 1 deletion.
diff --git a/src/FSharpPlus/Extensions/IList.fs b/src/FSharpPlus/Extensions/IList.fs
@@ -14,4 +14,10 @@ module IList =
     /// <returns>The list converted to a System.Collections.Generic.IReadOnlyList</returns>
     let toIReadOnlyList (source: IList<_>) = ReadOnlyCollection source :> IReadOnlyList<_>
 
+    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
+
 #endif
diff --git 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
+        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