📖 DOC: Add cloneDeep() function for deep cloning objects and arrays

63.create-cloneDeep.md

@@ -71,6 +71,28 @@ function cloneDeep(data) {
 }
 ```
 
+#
+
+### Explanation
+Let's break down the selected code:
+
+1. `const cachedResult = new WeakMap();` This line creates a new WeakMap that will be used to store cloned objects. This is used to handle circular references in the object being cloned.
+
+2. `function cloneDeep(data) {...}` This is the main function that performs a deep clone of an object. It takes an object as input and returns a new object that is a deep copy of the input.
+
+3. Inside `cloneDeep` the function first checks if the input is null or not an object. If it is, the input is returned as is.
+
+4. Then, it checks if the input is already in the `cachedResult` WeakMap. If it is, the function returns the cloned object from the WeakMap instead of cloning it again. This is how the function handles circular references.
+
+5. If the input is not in the `cachedResult` WeakMap, the function creates a new object or array to be the clone, depending on whether the input is an array or not.
+
+6. The function then stores the input and its clone in the `cachedResult` WeakMap.
+
+7. The function gets all the own property names and symbols of the input, and for each one, it sets the corresponding property of the clone to be a deep clone of the property of the input. This is done recursively using `cloneDeep`
+
+8. Finally, the function returns the clone.
+
+
 #
 
 ### Reference