make mapped signal readable

packages/signals/examples/map_signal.rs

@@ -0,0 +1,51 @@
+#![allow(non_snake_case)]
+
+use dioxus::prelude::*;
+use dioxus_signals::Signal;
+
+fn main() {
+    launch(app);
+}
+
+fn app() -> Element {
+    let mut vec = use_signal(|| vec![0]);
+
+    rsx! {
+        button {
+            onclick: move |_| {
+                let mut write = vec.write();
+                let len = write.len() as i32;
+                write.push(len);
+            },
+            "Create"
+        }
+
+        button {
+            onclick: move |_| {
+                vec.write().pop();
+            },
+            "Destroy"
+        }
+
+        for i in 0..vec.len() {
+            Child { count: vec.map(move |v| &v[i]) }
+        }
+    }
+}
+
+#[component]
+fn Child(count: MappedSignal<i32, Signal<Vec<i32>>>) -> Element {
+    use_memo({
+        to_owned![count];
+        move || {
+            let value = count.read();
+            print!("Child value: {value}");
+        }
+    });
+
+    rsx! {
+        div {
+            "Child: {count}"
+        }
+    }
+}