project: Add Leaderoard functionality

Tags tdd oop
Hard Prerequisites
IMPORTANT: Please review these prerequisites, they include important information that will help you with this content.
  • PROJECTS: [TODO] Gamification engine

    • Leaderboards

    The next thing we need is to be able to see who is winning. Create a function called leaderboard. It needs to return a string. This is best explained through an example:

    engine = GameEngine(["pull_request_reviews_done","acceptance_reviews_done","pull_requests_made","pull_requests_merged"])

engine.add_points("tshepo@whatever.org","pull_request_reviews_done",10)
engine.add_points("tshepo@whatever.org","acceptance_reviews_done",1)
engine.add_points("bob@whatever.org","pull_request_reviews_done",1)

engine.leaderboard("pull_request_reviews_done")
// returns:
// 1: tshepo@whatever.org [10]
// 2: bob@whatever.org [1]

engine.leaderboard("acceptance_reviews_done")
// returns:
// 1: tshepo@whatever.org [1]
// 2: bob@whatever.org [0]

engine.leaderboard("pull_requests_merged")
// returns:
// 1: bob@whatever.org [0]
// 2: tshepo@whatever.org [0]
    • each line has the format {position} {player} [{score}]
    • one line per player
    • if two or more users are tied then arrange them alphabetically. See engine.leaderboard("pull_requests_merged") in the example above.
    • the leaderboard contains a maximum of 10 users
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