File size: 1,168 Bytes
4b876a7 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | module.exports = recommend;
function recommend(repoName, repoMap, userMap) {
var followers = repoMap.get(repoName);
var result = [];
var related = getRepositoriesStarredByFollowers(followers);
related.forEach(computeSimilarity);
return result.sort(bySimilarity);
function computeSimilarity(otherRepo) {
var otherFollowers = repoMap.get(otherRepo);
var total = followers.size + otherFollowers.size;
var shared = 0;
var a = followers.size < otherFollowers.size ? followers : otherFollowers;
var b = followers.size < otherFollowers.size ? otherFollowers : followers;
for (var i of a) {
if (b.has(i)) shared += 1;
}
result.push({
n: otherRepo,
// regular jaccard similarity:
r: shared / (total - shared)
});
}
function getRepositoriesStarredByFollowers(followers) {
var repositories = new Set();
followers.forEach(getStarredRepositories);
return repositories;
function getStarredRepositories(user) {
userMap.get(user).forEach(function(otherRepo) {
repositories.add(otherRepo);
});
}
}
function bySimilarity(x, y) {
return y.r - x.r;
}
}
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