# Branch

### 📖 Definition:

The [`Branch Node`](https://github.com/Aleksao998/MerklePatriciaTrie/blob/main/trie/nodes/branch.go) in MPT is a unique node type designed to represent potential multiple paths at a given point in the trie. Unlike Leaf and Extension nodes, a Branch Node can point to multiple children, making it instrumental in diverging paths based on key differences.

### 📌 Key Characteristics:

1. **Path Divergence**: Where paths within the trie differ, a Branch Node stands as the point of divergence, directing to different child nodes based on key segments
2. **Multiple Children**: A Branch Node features 16 slots, each corresponding to a nibble value from 0-F. This allows it to potentially reference 16 distinct child nodes, based on key segments
3. **Optional Value Storage**: While primarily serving as a path diverger, a Branch Node can also store a value directly if a key corresponds to its position in the trie

### 🛠️ Structure:

The Branch Node's Go representation is as follows:

```go
type BranchNode struct {
	Children   [BranchChildrenSize]Node
	Value      []byte
	childCount int
	Dirty      bool
}
```

* `Children`: An array structured to accommodate up to 16 child nodes, each slot catering to a unique nibble from 0-F
* `Value`: Contains any direct data value associated with the current node's position in the trie
* `childCount`: An integer tracker that records the number of children currently linked by the Branch Node
* `Dirty`: A boolean flag signifying whether the node has seen modifications since its last commit


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