Function flatten

pattern/graph/graph.js:1294–1301

(array)

     */
    // Based on: Connelly Barnes, http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/119466
    function flatten(array) {
        // Flattens a linked list of the form [0,[1,[2,[]]]]
        var a = [];
        for (var i=0; i < array.length; i++) {
            (array[i] instanceof Array)? a=a.concat(flatten(array[i])) : a.push(array[i]);
        }
        return a;
    }
    var G = Graph.adjacency(graph, a);
    var q = new Heap(); q.push([0, id1, []], 0);
    var visited = {};