A keyed node helps optimize cases where children are getting added, moved, removed, etc. Common examples include:
When you use a keyed node, every child is paired with a string identifier. This makes it possible for the underlying diffing algorithm to reuse nodes more efficiently.
node : String -> List (Html.Attribute msg) -> List ( String, Html msg ) -> Html msg
Works just like Html.node
, but you add a unique identifier to each child
node. You want this when you have a list of nodes that is changing: adding
nodes, removing nodes, etc. In these cases, the unique identifiers help make
the DOM modifications more efficient.
ol : List (Html.Attribute msg) -> List ( String, Html msg ) -> Html msg
ul : List (Html.Attribute msg) -> List ( String, Html msg ) -> Html msg