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Ranking System v2 #1186

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May 26, 2023
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110 changes: 37 additions & 73 deletions src/calculateRank.js
Original file line number Diff line number Diff line change
@@ -1,93 +1,57 @@
// https://stackoverflow.com/a/5263759/10629172
function normalcdf(mean, sigma, to) {
var z = (to - mean) / Math.sqrt(2 * sigma * sigma);
var t = 1 / (1 + 0.3275911 * Math.abs(z));
var a1 = 0.254829592;
var a2 = -0.284496736;
var a3 = 1.421413741;
var a4 = -1.453152027;
var a5 = 1.061405429;
var erf =
1 - ((((a5 * t + a4) * t + a3) * t + a2) * t + a1) * t * Math.exp(-z * z);
var sign = 1;
if (z < 0) {
sign = -1;
}
return (1 / 2) * (1 + sign * erf);
function expsf(x, lambda=1.) {
return 2 ** (-lambda * x);
}

function calculateRank({
totalRepos,
totalRepos, // unused
totalCommits,
contributions,
contributions, // unused
followers,
prs,
issues,
stargazers,
}) {
const COMMITS_OFFSET = 1.65;
const CONTRIBS_OFFSET = 1.65;
const ISSUES_OFFSET = 1;
const STARS_OFFSET = 0.75;
const PRS_OFFSET = 0.5;
const FOLLOWERS_OFFSET = 0.45;
const REPO_OFFSET = 1;

const ALL_OFFSETS =
CONTRIBS_OFFSET +
ISSUES_OFFSET +
STARS_OFFSET +
PRS_OFFSET +
FOLLOWERS_OFFSET +
REPO_OFFSET;

const RANK_S_VALUE = 1;
const RANK_DOUBLE_A_VALUE = 25;
const RANK_A2_VALUE = 45;
const RANK_A3_VALUE = 60;
const RANK_B_VALUE = 100;

const TOTAL_VALUES =
RANK_S_VALUE + RANK_A2_VALUE + RANK_A3_VALUE + RANK_B_VALUE;

// prettier-ignore
const score = (
totalCommits * COMMITS_OFFSET +
contributions * CONTRIBS_OFFSET +
issues * ISSUES_OFFSET +
stargazers * STARS_OFFSET +
prs * PRS_OFFSET +
followers * FOLLOWERS_OFFSET +
totalRepos * REPO_OFFSET
) / 100;

const normalizedScore = normalcdf(score, TOTAL_VALUES, ALL_OFFSETS) * 100;
const COMMITS_MEAN = 500, COMMITS_WEIGHT = 0.25;
const FOLLOWERS_MEAN = 50, FOLLOWERS_WEIGHT = 0.25;
const PRS_ISSUES_MEAN = 25, PRS_ISSUES_WEIGHT = 0.25;
const STARS_MEAN = 100, STARS_WEIGHT = 1.0;

const TOTAL_WEIGHT = (
COMMITS_WEIGHT +
FOLLOWERS_WEIGHT +
PRS_ISSUES_WEIGHT +
STARS_WEIGHT
);

const rank = (
COMMITS_WEIGHT * expsf(totalCommits, 1 / COMMITS_MEAN) +
FOLLOWERS_WEIGHT * expsf(followers, 1 / FOLLOWERS_MEAN) +
PRS_ISSUES_WEIGHT * expsf(prs + issues, 1 / PRS_ISSUES_MEAN) +
STARS_WEIGHT * expsf(stargazers, 1 / STARS_MEAN)
) / TOTAL_WEIGHT;

const RANK_S_PLUS = 0.025;
const RANK_S = 0.1;
const RANK_A_PLUS = 0.25;
const RANK_A = 0.50;
const RANK_B_PLUS = 0.75;

let level = "";

if (normalizedScore < RANK_S_VALUE) {
if (rank <= RANK_S_PLUS)
level = "S+";
}
if (
normalizedScore >= RANK_S_VALUE &&
normalizedScore < RANK_DOUBLE_A_VALUE
) {
else if (rank <= RANK_S)
level = "S";
}
if (
normalizedScore >= RANK_DOUBLE_A_VALUE &&
normalizedScore < RANK_A2_VALUE
) {
level = "A++";
}
if (normalizedScore >= RANK_A2_VALUE && normalizedScore < RANK_A3_VALUE) {
else if (rank <= RANK_A_PLUS)
level = "A+";
}
if (normalizedScore >= RANK_A3_VALUE && normalizedScore < RANK_B_VALUE) {
else if (rank <= RANK_A)
level = "A";
else if (rank <= RANK_B_PLUS)
level = "B+";
}
else
level = "B";

return { level, score: normalizedScore };
return {level, score: rank * 100};
}

module.exports = calculateRank;
46 changes: 37 additions & 9 deletions tests/calculateRank.test.js
Original file line number Diff line number Diff line change
Expand Up @@ -2,17 +2,45 @@ require("@testing-library/jest-dom");
const calculateRank = require("../src/calculateRank");

describe("Test calculateRank", () => {
it("should calculate rank correctly", () => {
it("new user gets B rank", () => {
expect(
calculateRank({
totalCommits: 100,
totalRepos: 5,
followers: 100,
contributions: 61,
stargazers: 400,
prs: 300,
issues: 200,
totalRepos: 0,
totalCommits: 0,
contributions: 0,
followers: 0,
prs: 0,
issues: 0,
stargazers: 0,
}),
).toStrictEqual({ level: "A+", score: 49.16605417270399 });
).toStrictEqual({level: "B", score: 100.});
});

it("average user gets A rank", () => {
expect(
calculateRank({
totalRepos: 10,
totalCommits: 500,
contributions: 500,
followers: 50,
prs: 12,
issues: 13,
stargazers: 100,
}),
).toStrictEqual({"A", score: 50.});
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});

it("Linus Torvalds gets S+ rank", () => {
expect(
calculateRank({
totalRepos: 4,
totalCommits: 20000,
contributions: 20000,
followers: 132000,
prs: 71,
issues: 2,
stargazers: 109100,
}),
).toStrictEqual({level: "S+", score: 1.8875322153011722});
});
});