diff --git a/packages/rtl-generics/src/generics.collections.pas b/packages/rtl-generics/src/generics.collections.pas
index b1789d539c..73157d6d59 100644
--- a/packages/rtl-generics/src/generics.collections.pas
+++ b/packages/rtl-generics/src/generics.collections.pas
@@ -121,6 +121,9 @@ type
     class function BinarySearch(const AValues: array of T; const AItem: T;
       out AFoundIndex: SizeInt; const AComparer: IComparer<T>;
       AIndex, ACount: SizeInt): Boolean; override; overload;
+    class function Concat(const Args: array of TArray<T>): TArray<T>; static;
+    class procedure Copy(const aSource: array of T; var aDestination: array of T; aCount: NativeInt); overload;
+    class procedure Copy(const aSource: array of T; var aDestination: array of T; aSourceIndex, aDestIndex, aCount: SizeInt); overload;
   end {$ifdef EXTRA_WARNINGS}experimental{$endif}; // will be renamed to TArray (bug #24254)
 
   TCollectionNotification = (cnAdding, cnAdded, cnDeleting, cnRemoved, cnExtracting,  cnExtracted);
@@ -961,12 +964,34 @@ type
   end;
 
 function InCircularRange(ABottom, AItem, ATop: SizeInt): Boolean;
+procedure ErrorArgumentOutOfRange; overload;
+procedure ErrorArgumentOutOfRange(aIndex, aMaxIndex: SizeInt; aListObj: TObject); overload;
+procedure ErrorArgumentOutOfRange(aIndex, aMaxIndex: SizeInt); overload;
 
 var
   EmptyRecord: TEmptyRecord;
 
 implementation
 
+
+procedure ErrorArgumentOutOfRange;
+
+begin
+  raise EArgumentOutOfRangeException.Create(SArgumentOutOfRange);
+end;
+
+procedure ErrorArgumentOutOfRange(aIndex, aMaxIndex: SizeInt; aListObj: TObject); overload;
+
+begin
+  raise EArgumentOutOfRangeException.Create(ListIndexErrorMsg(aIndex,aMaxIndex,aListObj));
+end;
+
+procedure ErrorArgumentOutOfRange(aIndex, aMaxIndex: SizeInt); overload;
+
+begin
+  raise EArgumentOutOfRangeException.Create(ListIndexErrorMsg(aIndex,aMaxIndex,''));
+end;
+
 function InCircularRange(ABottom, AItem, ATop: SizeInt): Boolean;
 begin
   Result :=
@@ -1211,6 +1236,58 @@ begin
   end;
 end;
 
+
+class procedure TArrayHelper<T>.Copy(const aSource: array of T; var aDestination: array of T; aCount: NativeInt);
+begin
+  Copy(aSource,aDestination,0,0,aCount);
+end;
+
+class procedure TArrayHelper<T>.Copy(const aSource: array of T; var aDestination: array of T; aSourceIndex, aDestIndex, aCount: SizeInt);
+
+var
+  I : Integer;
+
+begin
+  if (Length(aSource)>0) and (Length(aDestination)>0) and ((@aSource[0]) = (@aDestination[0]))  then
+    raise EArgumentException.Create(SErrSameArrays);
+  if (aCount<0) or
+     (aCount>(Length(aSource)-aSourceIndex)) or
+     (aCount>(Length(aDestination)-aDestIndex)) then
+    ErrorArgumentOutOfRange;
+
+  if IsManagedType(T) then
+    begin
+    // maybe this can be optimized too ?
+    For I:=0 to aCount-1 do
+      aDestination[aDestIndex+i]:=aSource[aSourceIndex+i];
+    end
+  else
+    Move(Pointer(@aSource[aSourceIndex])^, Pointer(@aDestination[aDestIndex])^, SizeOf(T)*aCount);
+end;
+
+class function TArrayHelper<T>.Concat(const Args: array of TArray<T>): TArray<T>;
+
+var
+  TotalLen: SizeInt;
+  CurLen,Dest,i: SizeInt;
+
+begin
+  TotalLen:=0;
+  for i:=0 to Length(Args)-1 do
+    Inc(TotalLen,Length(Args[i]));
+  SetLength(Result,TotalLen);
+  Dest:=0;
+  for i:=0 to Length(Args)-1 do
+    begin
+    CurLen:=Length(Args[i]);
+    if CurLen>0 then
+      begin
+      Copy(Args[i],Result,0,Dest,CurLen);
+      Inc(Dest,CurLen);
+      end;
+    end;
+end;
+
 class function TArrayHelper<T>.BinarySearch(const AValues: array of T; const AItem: T;
   out AFoundIndex: SizeInt; const AComparer: IComparer<T>;
   AIndex, ACount: SizeInt): Boolean;
diff --git a/packages/rtl-generics/src/generics.strings.pas b/packages/rtl-generics/src/generics.strings.pas
index 117a6febfd..12da780091 100644
--- a/packages/rtl-generics/src/generics.strings.pas
+++ b/packages/rtl-generics/src/generics.strings.pas
@@ -33,6 +33,7 @@ resourcestring
   SDictionaryKeyDoesNotExist = 'Dictionary key does not exist';
   SDictionaryKeyNNNDoesNotExist = 'Dictionary key "%s" does not exist';
   SItemNotFound = 'Item not found';
+  SErrSameArrays = 'Cannot copy between same arrays';
 
 implementation