When to Use Html.Lazy in Elm: A Practical Decision Guide
Elm re-runs your whole view on every model change. This guide compares plain Html, Html.Keyed, and Html.Lazy, explains when memoization pays off, and shows a verifiable example.
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Elm re-runs your whole view on every model change. This guide compares plain Html, Html.Keyed, and Html.Lazy, explains when memoization pays off, and shows a verifiable example.
Goal Maintain reference stability for model slices passed to Html.Lazy to ensure the virtual DOM subtree is reused when the slice values remain unchanged. Constraints and Uncertainty The elm/html package implements Html.Lazy using reference identity rather than deep structural equality. In Elm, updating a record typically creates a new reference, which can t