diff --git a/undirected.js b/undirected.js
new file mode 100644
index 0000000..ff7de68
--- /dev/null
+++ b/undirected.js
@@ -0,0 +1,90 @@
+'use strict';
+
+class Graph {
+
+ constructor() {
+ this.vertex = [];
+ this.edge = [];
+ this.edgeCounter = 0;
+ }
+
+ addVert(vertex) {
+ this.vertex.push(vertex);
+ this.edge[vertex] = []; //all edges
+ }
+
+ addEdge(nodeFrom, nodeTo) {
+ this.edgeCounter++;
+ this.edge[nodeFrom].push(nodeTo);
+ this.edge[nodeTo].push(nodeFrom); //undirected!
+ }
+
+ //returns size of graph
+ vertexNumber() {
+ return this.vertex.length;
+ }
+
+ edgeNumber() {
+ return this.edgeCounter;
+ }
+
+ rmVert(vert) {
+ const pos = this.vertex.indexOf(vert);
+ if(pos !== -1) {
+ this.vertex.splice(pos, 1);
+ }
+ while (this.edge[vert].length) {
+ const second = this.edge[vert].pop();
+ this.rmEdge(second, vert);
+ }
+ }
+
+ rmEdge(nodeFrom, nodeTo) {
+ const pos1 = this.edge[nodeFrom] ? this.edge[nodeFrom].indexOf(nodeTo) : -1;
+ const pos2 = this.edge[nodeTo] ? this.edge[nodeTo].indexOf(nodeFrom) : -1;
+ if(pos1 !== -1) {
+ this.edge[nodeFrom].splice(pos1, 1);
+ this.edgeCounter--;
+ }
+ if(pos2 !== -1) {
+ this.edge[nodeTo].splice(pos2, 1);
+ }
+ }
+
+ output() {
+ let i;
+ for(i of this.vertex) {
+ console.dir('Vertex: ' + i);
+ let j;
+ for (j of this.edge[i]) {
+ console.dir('Edge: ' + j);
+ }
+ }
+
+ console.dir('Graph has ' + this.vertexNumber() + ' nodes');
+ console.dir('Graph has ' + this.edgeNumber() + ' edges');
+ }
+
+}
+
+const graph = new Graph();
+graph.addVert('first');
+graph.addVert('second');
+graph.addVert('third');
+graph.addVert('fourth');
+graph.addVert('fifth');
+graph.addVert('sixth');
+graph.output();
+graph.addEdge('first', 'second');
+graph.addEdge('first', 'fifth');
+graph.addEdge('fourth', 'fifth');
+graph.addEdge('fifth', 'second');
+graph.addEdge('third', 'fourth');
+graph.addEdge('second', 'third');
+graph.addEdge('fourth', 'sixth');
+graph.output();
+graph.rmEdge('first', 'second');
+graph.rmEdge('fourth', 'fifth');
+graph.rmEdge('something', '????');
+graph.rmVert('fifth');
+graph.output();
\ No newline at end of file
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