# `GSLayer addSelection:`

*Instance Method*

Adds an element to the selection if it is not already selected.

## Declaration

```swift
func addSelection(_ newSelection: any GSSelectableElementProtocol)
```

```objc
- (void) addSelection:(GSSelectableElement *) newSelection;
```

```python
addSelection_(newSelection: GSSelectableElement)
```

## See Also

### Selection

- [`GSLayer.selection`](/Core/GlyphsCore/GSLayer/selection) — The selected elements in selection order.
- [`GSLayer countOfSelection`](/Core/GlyphsCore/GSLayer/countOfSelection) — The number of selected elements.
- [`GSLayer setSelectionUndo:`](/Core/GlyphsCore/GSLayer/setSelectionUndo:) — Replaces the selection and registers the previous selection for undo.
- [`GSLayer addObjectsFromArrayToSelection:`](/Core/GlyphsCore/GSLayer/addObjectsFromArrayToSelection:) — Adds elements to the selection, preserving their order.
- [`GSLayer replaceSelection:`](/Core/GlyphsCore/GSLayer/replaceSelection:) — Replaces the selection without registering undo.
- [`GSLayer removeObjectFromSelectionAtIndex:`](/Core/GlyphsCore/GSLayer/removeObjectFromSelectionAtIndex:) — Removes the selected element at an index.
- [`GSLayer removeObjectFromSelection:`](/Core/GlyphsCore/GSLayer/removeObjectFromSelection:) — Removes an element from the selection.
- [`GSLayer removeObjectsFromSelection:`](/Core/GlyphsCore/GSLayer/removeObjectsFromSelection:) — Removes elements from the selection.
- [`GSLayer clearSelection`](/Core/GlyphsCore/GSLayer/clearSelection) — Clears the selection without registering undo.
- [`GSLayer clearSelectionUndo`](/Core/GlyphsCore/GSLayer/clearSelectionUndo) — Clears the selection and registers the previous selection for undo.
- [`GSLayer selectionContainsObject:`](/Core/GlyphsCore/GSLayer/selectionContainsObject:) — Whether an element is selected.