The leaderboard that forgets who it skipped

A teammate asked the AI assistant: "Write a `rankPlayers(players)` function for our quiz leaderboard. Sort by score, highest first, and attach a `rank` to each player. Use standard competition ranking: players with the same score share a rank, and the next distinct score gets the rank it would have in a plain numbered list (so 1, 2, 2, 4, not 1, 2, 2, 3). Also add a `rankOf(players, name)` helper for the profile page." The code came back in under a minute, with passing tests. The contract promised by the docstring: - Output is sorted by `score`, highest first; input order is kept among equal scores. - `rank` starts at 1. Equal scores share the same rank. - After a tie, the next rank accounts for every tied player: a player's rank is always one more than the number of players strictly ahead of them. - `rankOf` returns that same rank for a single player, or `null` if the name is not on the board. Review it before it ships to the weekly tournament page.

import { describe, it, expect } from "@debunk/harness";
import { rankPlayers, rankOf } from "./code";

describe("rankPlayers", () => {
  it("sorts by score, highest first, and numbers the ranks", () => {
    const board = rankPlayers([
      { name: "mia", score: 40 },
      { name: "leo", score: 90 },
      { name: "sam", score: 65 },
    ]);
    expect(board.map((p) => p.name)).toEqual(["leo", "sam", "mia"]);
    expect(board.map((p) => p.rank)).toEqual([1, 2, 3]);
  });

  it("gives a single player rank 1", () => {
    expect(rankPlayers([{ name: "leo", score: 10 }])[0].rank).toBe(1);
  });

  it("rankOf finds a player's rank by name", () => {
    const players = [
      { name: "mia", score: 40 },
      { name: "leo", score: 90 },
    ];
    expect(rankOf(players, "mia")).toBe(2);
    expect(rankOf(players, "nobody")).toBeNull();
  });
});