graph

GraphJS

GraphJS is a simple Javascript library for manipulating directed and undirected graphs.

Your graphs may have self edges, weighted edges, and directed edges, but not multiedges.

GraphJS uses QUnit and steel for testing.

Usage

Creating, reading, updating, and deleting edges (CRUD)

var g = new Graph();

g.set('a', 'b', 3); # creates edge (a, b) with weight 3
g.get('a', 'b'); # returns 3

g.set('a', 'b', 4); # changes (a, b) weight to 4
g.get('a', 'b'); # returns 4

g.del('a', 'b'); # removes edge (a, b)
g.get('a', 'b'); # returns undefined

Constructing graphs from data

new Graph({
  a: ['b', 'c'],
  c: ['d'],
}); # triangle with vertices a, b, and c

new Graph({
  a: {b: 2},
  b: {c: 3},
}); # path with vertices a, b, c and weights (a, b) = 2, (b, c) = 3

Degree, size, order, and adjacency

var g = new Graph({
  a: ['b'],
  b: ['c'],
}); # path with vertices a, b, c

g.degree('a'); # returns 1
g.degree('b'); # returns 2
g.degree('c'); # returns 1

g.size(); # returns 2, the number of edges

g.order(); # returns 3, the number of vertices

for (v in g.adj('b')) {
  # v = a, c (in no particular order)
}

Creating directed edges

var g = new Graph();
g.dir('a', 'b'); # a ~ b, but b !~ a
g.has('a', 'b'); # true
g.has('b', 'a'); # false

Deleting directed edges

var g = new Graph();
g.set('a', 'b'); # a ~ b, and b ~ a
g.deldir('b', 'a'); # remove b ~ a
g.has('a', 'b'); # true
g.has('b', 'a'); # false

Copying

var g = new Graph({
  a: ['b', 'c'],
  c: ['d'],
});

var h = g.copy(); # an independent copy of g

Directed edges and graph size

You may mix directed and undirected edges in the same graph.

A pair of directed edges (a, b) and (b, a) is always collapsed into an undirected edge. An undirected edge (a, b) may be expanded into a directed edge (a, b) by deleting the directed edge (b, a) with deldir(b, a).

For consistency, the size of a graph is defined to be the number of undirected edges plus the number of directed edges. In other words, two distinct directed edges between two distinct vertices do not count twice for the size.

A directed self edge is indistinguishable from an undirected self edge.

Tests

GraphJS is packaged with tests for several different environments.

Browser (QUnit)

see QUnit

Load the graphjs/test/all.html page in your favorite browser.

Tests completed in 88 milliseconds.
0 tests of 160 failed.

Narwhal

see Narwhal

You can run the separate tests with narwhal.

$ narwhal -m test test/core.js
+ Running test/core.js
Passes: 24, Fails: 0, Errors: 0

Or all tests.

$ narwhal test/all.js
+ Running
Passes: 24, Fails: 0, Errors: 0
+ Running
Passes: 14, Fails: 0, Errors: 0

Node

see Node

You can run the individual tests with node.

$ node test/core.js
+ Running
Passes: 24, Fails: 0, Errors: 0

Or all tests.

$ node test/all.js
+ Running
Passes: 24, Fails: 0, Errors: 0
+ Running
Passes: 14, Fails: 0, Errors: 0

JavaScriptCore

see JavaScriptCore

You can run the separate tests with jsc.

$ jsc test/core.js
+ Running
Passes: 24, Fails: 0, Errors: 0

Or all tests.

$ jsc test/all.js
+ Running
Passes: 24, Fails: 0, Errors: 0
+ Running
Passes: 14, Fails: 0, Errors: 0

RingoJS

see RingoJS

You can run the separate tests with ringo.

$ ringo test/core.js
+ Running
Passes: 24, Fails: 0, Errors: 0

Or all the tests.

$ ringo test/all.js
+ Running
Passes: 24, Fails: 0, Errors: 0
+ Running
Passes: 14, Fails: 0, Errors: 0