adding Graph data structure

Data Structures/Graph/Graph.js

@@ -0,0 +1,50 @@
+
+class Graph {
+
+    constructor() {
+        this.adjacencyMap = {}
+    }
+
+    addVertex(v) {
+        this.adjacencyMap[v] = [];
+    }
+
+    containsVertex(vertex) {
+        return typeof (this.adjacencyMap[vertex]) !== "undefined"
+    }
+
+    addEdge(v, w) {
+        let result = false
+        if (this.containsVertex(v) && this.containsVertex(w)) {
+            this.adjacencyMap[v].push(w);
+            this.adjacencyMap[w].push(v);
+            result = true
+        }
+        return result
+    }
+
+
+
+    printGraph() {
+        let keys = Object.keys(this.adjacencyMap);
+        for (let i of keys) {
+            let values = this.adjacencyMap[i];
+            let vertex = "";
+            for (let j of values)
+                vertex += j + " ";
+            console.log(i + " -> " + vertex);
+        }
+    }
+
+}
+
+
+const example = () => {
+    let g = new Graph()
+    g.addVertex(1)
+    g.addVertex(2)
+    g.addVertex(3)
+    g.addEdge(1, 2)
+    g.addEdge(1, 3)
+    g.printGraph()
+}