Snips to merge objects in different languages #74

src/mergeObjects.md

@@ -3,36 +3,143 @@ Merges two or more objects.
 
 ## Result
 ```js
-  merge({ a: [1,2,3], b: 1 }, { a: 4, c: 'bar' }); // { a: [1,2,3,4], b: 1, c: 'bar' }
+merge({ a: [1, 2, 3], b: 1 }, { a: 4, c: "bar" }); // { a: [1,2,3,4], b: 1, c: 'bar' }
 ```
 
 ## Snip Langauge
-* [JavaScript](#javascript)
+- [JavaScript](#javascript)
+- [Python](#python)
+- [Java] (#java)
+- [CPP] (#cpp)
 
 ### JavaScript
 ```js
-  const merge = (...arr) => {
-    arr = arr.filter(obj => typeof obj == 'object' && obj !== null)
-    const keys = [], result = {}
-    arr.forEach(obj => {
-      Object.keys(obj).forEach(key => {
-        if(!keys.includes(key)) keys.push(key)
-      })
-    })
-
-    for(const key of keys){
-      let newValue
-      for(const obj of arr){
-        if(Array.isArray(obj[key])){
-          if(Array.isArray(newValue)) 
-            newValue = newValue.concat(obj[key].filter(x => !newValue.includes(x)))
-          else newValue = obj[key]
-        }
-        else if(Array.isArray(newValue)) newValue.push(obj[key])
-        else if(obj[key]) newValue = obj[key]
-      }
-      result[key] = newValue
+const merge = (...arr) => {
+  arr = arr.filter((obj) => typeof obj == "object" && obj !== null);
+  const keys = [],
+    result = {};
+  arr.forEach((obj) => {
+    Object.keys(obj).forEach((key) => {
+      if (!keys.includes(key)) keys.push(key);
+    });
+  });
+
+  for (const key of keys) {
+    let newValue;
+    for (const obj of arr) {
+      if (Array.isArray(obj[key])) {
+        if (Array.isArray(newValue))
+          newValue = newValue.concat(
+            obj[key].filter((x) => !newValue.includes(x))
+          );
+        else newValue = obj[key];
+      } else if (Array.isArray(newValue)) newValue.push(obj[key]);
+      else if (obj[key]) newValue = obj[key];
     }
-    return result
+    result[key] = newValue;
   }
+  return result;
+};
+```
+
+### Python
+```python
+def merge(*args):
+    args = [obj for obj in args if isinstance(obj, dict)]
+    keys, result = set(), {}
+
+    for obj in args:
+        keys.update(obj.keys())
+
+    for key in keys:
+        new_value = None
+        for obj in args:
+            if isinstance(obj.get(key), list):
+                if isinstance(new_value, list):
+                    new_value += [x for x in obj[key] if x not in new_value]
+                else:
+                    new_value = obj[key]
+            elif isinstance(new_value, list):
+                new_value.append(obj[key])
+            elif obj.get(key):
+                new_value = obj[key]
+        result[key] = new_value
+
+    return result
+```
+
+### Java
+```java
+public static Map<String, Object> merge(Map<String, Object>... maps) {
+    Map<String, Object> result = new HashMap<>();
+    Set<String> keys = new HashSet<>();
+
+    for (Map<String, Object> map : maps) {
+        keys.addAll(map.keySet());
+    }
+
+    for (String key : keys) {
+        Object newValue = null;
+        for (Map<String, Object> map : maps) {
+            if (map.containsKey(key)) {
+                Object value = map.get(key);
+                if (value instanceof List) {
+                    if (newValue instanceof List) {
+                        ((List) newValue).addAll((List) value);
+                    } else {
+                        newValue = new ArrayList<>((List) value);
+                    }
+                } else if (newValue instanceof List) {
+                    ((List) newValue).add(value);
+                } else {
+                    newValue = value;
+                }
+            }
+        }
+        result.put(key, newValue);
+    }
+    return result;
+}
+```
+
+### CPP
+```cpp
+using Value = variant<int, string, vector<int>>;
+using Dictionary = map<string, Value>;
+
+Dictionary merge(vector<Dictionary> arr) {
+    set<string> keys;
+    Dictionary result;
+
+    for (const auto& obj : arr) {
+        for (const auto& [key, value] : obj) {
+            keys.insert(key);
+        }
+    }
+
+    for (const string& key : keys) {
+        Value newValue;
+        for (const auto& obj : arr) {
+            if (obj.find(key) != obj.end()) {
+                if (holds_alternative<vector<int>>(obj.at(key))) {
+                    if (holds_alternative<vector<int>>(newValue)) {
+                        vector<int>& oldVec = get<vector<int>>(newValue);
+                        const vector<int>& newVec = get<vector<int>>(obj.at(key));
+                        oldVec.insert(oldVec.end(), newVec.begin(), newVec.end());
+                        sort(oldVec.begin(), oldVec.end());
+                        oldVec.erase(unique(oldVec.begin(), oldVec.end()), oldVec.end());
+                    } else {
+                        newValue = obj.at(key);
+                    }
+                } else if (holds_alternative<vector<int>>(newValue)) {
+                    get<vector<int>>(newValue).push_back(get<int>(obj.at(key)));
+                } else {
+                    newValue = obj.at(key);
+                }
+            }
+        }
+        result[key] = newValue;
+    }
+    return result;
+}
 ```