Reformatted code to match style guide

Author: donald-pinckney

Graph/Graph.playground/Contents.swift

@@ -1,21 +1,42 @@
 public struct GraphEdge<T> {
-    let from: GraphVertex<T>
-    let to: GraphVertex<T>
-    let weight: Int
+  let from: GraphVertex<T>
+  let to: GraphVertex<T>
+  let weight: Int
 }
 
 public struct GraphVertex<T> {
-    public var data: T
-    private var edges: [GraphEdge<T>] // This is a simple adjacency list, rather than matrix
-    
-    public mutating func connectTo(destinationVertex: GraphVertex<T>, withWeight weight: Int = 0) {
-        edges.append(GraphEdge(from: self, to: destinationVertex, weight: weight))
-    }
-    
-    public mutating func connectBetween(inout otherVertex: GraphVertex<T>, withWeight weight: Int = 0) {
-        edges.append(GraphEdge(from: self, to: otherVertex, weight: weight))
-        otherVertex.edges.append(GraphEdge(from: otherVertex, to: self, weight: weight))
-    }
+  public var data: T
+  private var edges: [GraphEdge<T>] = [] // This is a simple adjacency list, rather than matrix
+  
+  public init(data: T) {
+    self.data = data
+  }
+  
+  // Creates a directed edge self -----> dest
+  public mutating func connectTo(destinationVertex: GraphVertex<T>, withWeight weight: Int = 0) {
+    edges.append(GraphEdge(from: self, to: destinationVertex, weight: weight))
+  }
+  
+  // Creates an undirected edge by making 2 directed edges: self ----> other, and other ----> self
+  public mutating func connectBetween(inout otherVertex: GraphVertex<T>, withWeight weight: Int = 0) {
+    edges.append(GraphEdge(from: self, to: otherVertex, weight: weight))
+    otherVertex.edges.append(GraphEdge(from: otherVertex, to: self, weight: weight))
+  }
 }
 
 
+
+
+var v1 = GraphVertex(data: 1)
+var v2 = GraphVertex(data: 2)
+var v3 = GraphVertex(data: 3)
+var v4 = GraphVertex(data: 4)
+
+// v1 ---> v2 ---> v3 ---> v4
+// ^                       |
+// |                       V
+// -----------<------------|
+v1.connectTo(v2)
+v2.connectTo(v3)
+v3.connectTo(v4)
+v4.connectTo(v1)