adding Graph data structure

Author: ntedgi

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()
+}