From 00842023406e0c55dd438621045e41f28cac6aca Mon Sep 17 00:00:00 2001 From: Anna Yasenova Date: Tue, 14 Mar 2017 00:20:02 +0200 Subject: [PATCH] Simple implementation of undirected graph. --- undirected.js | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 undirected.js 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 pFad - Phonifier reborn

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