Relations.js

/*
userData = {
	'person1' : [1,2,3,4],
	'person2' : [3,4,5,6]
}

function returns

{
	'person1': {'person2': [3, 4]},
	'person2': {'person1': [3, 4]}
}
*/
function calculateRelations(userData) {
	sys.puts('calc');

	var start = new Date().getTime() / 100;

	var matches = {};
	for (key in userData) {
		matches[key] = {};

		for (subKey in userData) {
			if (key !== subKey) {
				for (var i = 0, l = userData[key].length; i < l; i++) {
					for (var u = 0, le = userData[key].length; u < le; u++) {
						if (userData[key][i] === userData[subKey][u]) {
							if (!matches[key][subKey]) {
								matches[key][subKey] = [];
							}
							matches[key][subKey].push(userData[subKey][u]);
						}
					}
				};

			}
		}
	}

	var end = new Date().getTime() / 100;
	sys.p('Calculation took: ' + (end - start) + 'sec');

	return matches;
}