Clone an object or an array

Bag-of-Tricks.md

@@ -401,35 +401,35 @@ Throwing<DynamicJsonBuffer> jsonBuffer;
 
 See issue [#205](https://github.com/bblanchon/ArduinoJson/issues/205).
 
-## Reuse JsonBuffer
-
-:warning: **JsonBuffer are designed to be non reusable.**
-
-:warning: **This is on purpose and this is actually here to help!**
-
-:warning: **It prevents memory leaks and dangling pointer.**
-
-:warning: **This section is only intended to insane people who deliberately ignores the recommendation of the library author.**
-
-:warning: [READ THE FAQ BEFORE USING THIS!!!!!!!](https://bblanchon.github.io/ArduinoJson/faq/how-to-reuse-a-jsonbuffer/)
-
-
-Here is how you can write your own `clear()` function:
+## Clone an object or an array
 
 ```c++
-template<typename T>
-void clear(T& instance)
+JsonVariant clone(JsonBuffer& jb, JsonVariant prototype)
 {
-    instance = T();
+  if (prototype.is<JsonObject>()) {
+    const JsonObject& protoObj = prototype;
+    JsonObject& newObj = jb.createObject();
+    for (const auto& kvp : protoObj) {
+      newObj[kvp.key] = clone(jb, kvp.value);
+    }
+    return newObj;
+  }
+
+  if (prototype.is<JsonArray>()) {
+    const JsonArray& protoArr = prototype;
+    JsonArray& newArr = jb.createArray();
+    for (const auto& elem : protoArr) {
+      newArr.add(clone(jb, elem));
+    }
+    return newArr;
+  }
+
+  if (prototype.is<char*>()) {
+    return jb.strdup(prototype.as<char*>());
+  }
+
+  return prototype;
 }
 ```
 
-To use it in your code:
-
-```c++
-clear(jsonBuffer);
-```
-
-See issues [#72](https://github.com/bblanchon/ArduinoJson/issues/72), [#115](https://github.com/bblanchon/ArduinoJson/issues/115), [#141](https://github.com/bblanchon/ArduinoJson/issues/141)
-
-See [ArduinoJson: Avoiding pitfalls](https://bblanchon.github.io/ArduinoJson/doc/pitfalls/#4-dont-reuse-the-same-jsonbuffer)
+See issue [#533](https://github.com/bblanchon/ArduinoJson/issues/533)