Updated Bag of Tricks (markdown)

Bag-of-Tricks.md

@@ -109,6 +109,65 @@ root["value2"] = RawJson("[[\"Yes\",\"No\"],[\"Maybe\"]");
 
 See issue [#252](https://github.com/bblanchon/ArduinoJson/issues/252)
 
+## Merging JSON objects
+
+Suppose we have three JSON objects like these:
+
+```c++
+char json1[] = R"({
+    "fingerprint": "1234"
+  })";
+
+char json2[] = R"({
+    "Trait1":{
+        "someValue": "4321"
+    }
+  })";
+
+char json3[] = R"({
+    "Trait2":{
+        "anotherValue": "5555"
+    }
+  })";
+
+JsonObject& jsonObjectRoot = jsonBuffer1.parseObject(json1);
+JsonObject& jsonObjectOne  = jsonBuffer2.parseObject(json2);
+JsonObject& jsonObjectTwo  = jsonBuffer3.parseObject(json3);
+```
+And we want a JSON that looks like this:
+
+```json
+{
+    "fingerprint": "1234",
+    "SetOfObjects" : {
+        "Trait1":{
+            "someValue": "4321"
+        },
+        "Trait2":{
+            "anotherValue": "5555"
+    }
+  }
+}
+```
+
+This function allows to merge the JSON objects:
+
+```c++
+void merge(JsonObject& dest, JsonObject& src) {
+   for (auto kvp : src) {
+     dest[kvp.key] = kvp.value;
+   }
+}
+```
+Usage:
+```c++
+JsonObject& nestedObject = jsonObjectRoot.createNestedObject("SetOfObjects");
+merge(nestedObject, jsonObjectOne);
+merge(nestedObject, jsonObjectTwo);
+```
+
+See issue [#332](https://github.com/bblanchon/ArduinoJson/issues/332)
+
 ## Buffered output:
 
 Here is a proxy that will put bytes in a buffer before actually writing them to the destination: