add tryGetColumnByHeaderBy member and static + tests

src/Core/Table/ArcTable.fs

@@ -385,6 +385,16 @@ type ArcTable(name: string, headers: ResizeArray<CompositeHeader>, values: Syste
         fun (table:ArcTable) ->
             table.TryGetColumnByHeader(header)
 
+    // tryGetColumnByHeaderBy 
+    member this.TryGetColumnByHeaderBy (headerPredicate:CompositeHeader -> bool) = //better name for header / action
+        this.Headers 
+        |> Seq.tryFindIndex headerPredicate 
+        |> Option.map (fun i -> this.GetColumn(i))
+
+    static member tryGetColumnByHeaderBy (headerPredicate:CompositeHeader -> bool) = 
+        fun (table:ArcTable) -> 
+            table.TryGetColumnByHeaderBy(headerPredicate)
+
     member this.GetColumnByHeader (header:CompositeHeader) =
         match this.TryGetColumnByHeader(header) with
         | Some c -> c

tests/Core/ArcTable.Tests.fs

@@ -1863,6 +1863,44 @@ let private tests_RemoveColumns =
             Expect.equal table.Values.[(table.ColumnCount-1,table.RowCount-1)] (CompositeCell.createTerm oa_SCIEXInstrumentModel) "table.ColumnCount-1,table.RowCount-1"
         )
     ]
+
+let private tests_TryGetColumnByHeaderBy =
+    testList "TryGetColumnByHeaderBy" [                 
+        testCase "Empty column" (fun () ->
+            let emptyTable = ArcTable.init("empty table")
+            let column_species = CompositeColumn.create(CompositeHeader.Characteristic oa_species)
+            emptyTable.AddColumns[|column_species|]
+            let colOption = emptyTable.TryGetColumnByHeaderBy (fun (header:CompositeHeader) -> 
+                match header with 
+                | CompositeHeader.Characteristic oa -> oa = oa_species
+                | _ -> false )        
+            let col = Expect.wantSome colOption "should have found col but returned None"
+            // Expect.sequenceEqual col.Cells column_component.Cells "cells did not match"
+            Expect.hasLength col.Cells 0 "cells did not match"
+        )
+        testCase "Column with values" (fun () ->
+            let table = create_testTable()
+            let column_species = CompositeColumn.create(CompositeHeader.Characteristic oa_species, createCells_Term 8)
+            table.AddColumns[|column_species|]
+            let colOption = table.TryGetColumnByHeaderBy (fun (header:CompositeHeader) -> 
+                match header with
+                | CompositeHeader.Characteristic oa -> oa = oa_species
+                | _ -> false )
+            let col = Expect.wantSome colOption "should have found col but returned None"
+            // Expect.hasLength col.Cells 8 "cells did not match"
+            Expect.sequenceEqual col.Cells column_species.Cells "cells did not match"
+        )
+        testCase "Non-existing column" (fun () -> 
+            let table = create_testTable()
+            let colOption = table.TryGetColumnByHeaderBy (fun (header:CompositeHeader) -> 
+                match header with 
+                | CompositeHeader.Parameter oa -> oa = oa_temperature
+                | _ -> false ) 
+            Expect.isNone colOption "fails to find col therefore returns none"
+        )
+    ]
+
+
 let private tests_MoveColumn = 
     testList "MoveColumn" [
         testCase "CheckBoundaries" (fun () ->
@@ -2541,6 +2579,7 @@ let main =
         tests_AddColumnFill
         tests_RemoveColumn
         tests_RemoveColumns
+        tests_TryGetColumnByHeaderBy
         tests_MoveColumn
         tests_RemoveRow
         tests_RemoveRows