128-updateEl-for-iter-Map

Author: MartinKavik

Cargo.toml

@@ -82,7 +82,6 @@ members = [
     "examples/animation_frame",
     "examples/counter",
     # "examples/homepage",   # isn't Rust project
-    # "examples/mathjax",   # isn't Rust project
     "examples/mathjax",
     "examples/orders",
     # "examples/server_integration",   # has own workspace

examples/websocket/src/client.rs

@@ -54,11 +54,6 @@ fn update(msg: Msg, mut model: &mut Model, orders: &mut Orders<Msg>) {
     }
 }
 
-fn render_messages(msgs: &[String]) -> El<Msg> {
-    let msgs: Vec<_> = msgs.iter().map(|m| p![m]).collect();
-    div![msgs]
-}
-
 fn view(model: &Model) -> Vec<El<Msg>> {
     vec![
         h1!["seed websocket example"],
@@ -86,7 +81,7 @@ fn view(model: &Model) -> Vec<El<Msg>> {
         } else {
             div![p![em!["Connecting..."]]]
         },
-        render_messages(&model.messages),
+        div![model.messages.iter().map(|m| p![m])],
         footer![
             if model.connected {
                 p!["Connected"]

src/dom_types.rs

@@ -489,6 +489,17 @@ impl<Ms> UpdateEl<El<Ms>> for Optimize {
     }
 }
 
+impl<Ms, I, U, F> UpdateEl<El<Ms>> for std::iter::Map<I, F>
+where
+    I: Iterator,
+    U: UpdateEl<El<Ms>>,
+    F: FnMut(I::Item) -> U,
+{
+    fn update(self, el: &mut El<Ms>) {
+        self.for_each(|item| item.update(el));
+    }
+}
+
 /// Similar to tag population.
 macro_rules! make_attrs {
     // Create shortcut macros for any element; populate these functions in this module.