files/en-us/web/api/svglengthlist/replaceitem/index.md
{{APIRef("SVG")}}
The replaceItem() method of the {{domxref("SVGLengthList")}} interface replaces an existing item in the list with a new item. If the new item is already in a list, it is removed from its previous list before it is inserted into this list. The inserted item is the item itself and not a copy. If the item is already in this list, note that the index of the item to replace is before the removal of the item.
replaceItem(newItem, index)
newItem
index
The {{domxref("SVGLength")}} that was added the list.
NoModificationAllowedError {{domxref("DOMException")}}
IndexSizeError {{domxref("DOMException")}}
See {{domxref("SVGLengthList")}} for a complete example.
{{Specifications}}
{{Compat}}