Exercise (get second degree connections from graph data)

gistfile1.txt

var graph = {
    nodes: 
        [{
            userId: 'chill',
            city: 'Sonoma' },
        {
            userId: 'sjobs',
            city: 'Mountain View' },
        {
            userId: 'bgates',
            city: 'Sonoma' },
        {
            userId: 'someguy',
            city: 'Mountain View'
        },
        {
            userId: 'someotherguy',
            city: 'Mountain View'
        },
        {
            userId: 'ahill',
            city: 'Somewhere over the Rainbow'
        },
        {
            userId: 'randomSJguy',
            city: 'San Jose'
        }],
    connections: 
        [
          {
            userId1: 'chill',
            userId2: 'bgates',
            userId3: 'sjobs',
            userId4: 'someotherguy' },
          {
            userId1: 'sjobs',
            userId2: 'chill' },
          { 
            userId1: 'bgates',
            userId2: 'chill' },
          {
            userId1: 'sjobs',
            userId2: 'bgates' }
        ]
};

/* prepare data method generates following structure: 
{  
    'chill' : 
    {
        city: 'San Jose',
        connections: []
    }
}
*/

function prepareData(data) {
    var result = {};
    for (var i in data.nodes) {
        var key = data.nodes[i].userId;
        result[key] = {};
        result[key].city = data.nodes[i].city;
        result[key].connections = [];
        for (var j in data.connections) {
            if (data.connections[j].userId1 === data.nodes[i].userId) {
                for (var k in data.connections[j]) {
                    if (k !== 'userId1') {
                        result[key].connections.push(data.connections[j][k]);
                    }
                }
            }
        }
    }
    return result;
};


function secondDegree(id, city, data) {
    var firstDegrees = data[id].connections,
        results = [];
    for (var i in firstDegrees) {
        var curFirstDegree = firstDegrees[i],
            secondDegrees = data[curFirstDegree].connections,
            curCity, inFirstDegrees, inSecondDegrees;
        for (var j in secondDegrees) {
            curName = secondDegrees[j];
            curCity = data[secondDegrees[j]].city;
            inFirstDegrees = firstDegrees.indexOf(id);
            inSecondDegrees = secondDegrees.indexOf(id);
            if (curName !== id && curName !== curFirstDegree &&
                curCity === city && inFirstDegrees === -1) {
                results.push(secondDegrees[j]);
            }
        }
    }
    return results;
}

var data = prepareData(graph);
var location = 'Mountain View';
var results = secondDegree('bgates', location, data);
console.log('Matching second degree connections in %s: ', location, results);