A keyed node helps optimize cases where children are getting added, moved, removed, etc. Common examples include:
- The user can delete items from a list.
- The user can create new items in a list.
- You can sort a list based on name or date or whatever.
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.
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.