update

src/ui/primitives/div.rs

@@ -55,6 +55,36 @@ impl DivWidget {
         self
     }
 
+    #[must_use]
+    pub fn push_if<T: UIWidget + 'static, U: Fn() -> T>(
+        mut self,
+        condition: bool,
+        then: U,
+    ) -> Self {
+        if condition {
+            self.0.push(Box::new(then()));
+        }
+        self
+    }
+
+    #[must_use]
+    pub fn push_for<
+        'a,
+        T: UIWidget + 'static,
+        X: 'a,
+        U: Fn(&X) -> T,
+        I: IntoIterator<Item = &'a X>,
+    >(
+        mut self,
+        iterator: I,
+        then: U,
+    ) -> Self {
+        for val in iterator {
+            self.0.push(Box::new(then(val)));
+        }
+        self
+    }
+
     /// Extract the `<div>`s innerHTML
     ///
     /// This will render `<content>` instead of `<div> <content> </div>`