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6 changed files with 8 additions and 6 deletions
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@ -12,14 +12,14 @@ The [Hacker New's ranking algorithm](https://medium.com/hacking-and-gonzo/how-ha
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## My Algorithm
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```
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Rank = ScaleFactor * sign(Score) * log(1 + abs(Score)) / (Time + 2)^Gravity
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Rank = ScaleFactor * sign(3 + Score) * log(abs(3 + Score)) / (Time + 2)^Gravity
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Score = Upvotes - Downvotes
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Time = time since submission (in hours)
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Gravity = Decay gravity, 1.8 is default
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```
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- Add 1 to the score, so that the standard new comment score of +1 will be affected by time decay. Otherwise all new comments would stay at zero, near the bottom.
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- Add 3 to the score, so that even minimally downvoted comments will be affected by time decay. Otherwise all new comments would stay at zero, near the bottom.
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- The sign and abs of the score are necessary for dealing with the log of negative scores.
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- A scale factor of 10k gets the rank in integer form.
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@ -5,7 +5,7 @@ create or replace function hot_rank(
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returns integer as $$
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begin
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-- hours_diff:=EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600
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return floor(10000*sign(score)*log(1 + abs(score)) / power(((EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600) + 2), 1.8))::integer;
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return floor(10000*sign(3+score)*log(abs(3+score)) / power(((EXTRACT(EPOCH FROM (timezone('utc',now()) - published))/3600) + 2), 1.8))::integer;
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end; $$
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LANGUAGE plpgsql;
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@ -294,6 +294,7 @@ mod tests {
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post_id: inserted_post.id,
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parent_id: None,
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removed: None,
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read: None,
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updated: None
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};
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@ -465,6 +465,7 @@ mod tests {
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creator_id: inserted_user.id,
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post_id: inserted_post.id,
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removed: None,
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read: None,
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parent_id: None,
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updated: None
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};
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@ -259,7 +259,7 @@ mod tests {
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score: 1,
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upvotes: 1,
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downvotes: 0,
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hot_rank: 864,
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hot_rank: 1728,
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published: inserted_post.published,
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updated: None,
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subscribed: None,
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@ -284,7 +284,7 @@ mod tests {
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score: 1,
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upvotes: 1,
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downvotes: 0,
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hot_rank: 864,
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hot_rank: 1728,
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published: inserted_post.published,
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updated: None,
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subscribed: None,
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@ -21,7 +21,7 @@ export function hotRank(comment: Comment): number {
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let now: Date = new Date();
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let hoursElapsed: number = (now.getTime() - date.getTime()) / 36e5;
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let rank = (10000 * Math.sign(comment.score) * Math.log10(1 + Math.abs(comment.score))) / Math.pow(hoursElapsed + 2, 1.8);
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let rank = (10000 * Math.sign(3+comment.score) * Math.log10(Math.abs(3+comment.score))) / Math.pow(hoursElapsed + 2, 1.8);
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// console.log(`Comment: ${comment.content}\nRank: ${rank}\nScore: ${comment.score}\nHours: ${hoursElapsed}`);
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