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Knockout Tournament

The goal of this task is to simulate a single-elimination knockout tournament in the browser, determining the winner as quickly as possible.

We expect this task will take around 5 hours.

The simulation must implement the following flow:

  1. The user enters the teams participating per match (#teamsPerMatch).
  2. The user enters the number of teams participating in the tournament (a non-zero power of the #teamsPerMatch value)
  3. The user clicks the start button.
  4. The first round's match-ups are fetched from the server.
  5. The winner of a match moves on to the next round and matches up against the adjacent winner(s).
  6. Matches are simulated until the winning team is determined.
  7. The winning team's name is shown in the UI.

Both teams and matches have scores that are constant for the duration of the tournament. To simulate a match:

  1. The teams' scores are fetched from the server.
  2. The match's score is fetched from the server.
  3. All these scores are sent to the server and it returns the winning team's score.
  4. In the event of a tie, the team with the lowest ID wins.

UI Requirements

Please implement the simple UI wireframes outlined below. Minimal styling is acceptable.

Display a square for each match. Completed matches should be filled with a solid colour.

■ ■ ■ □ □ □ □

When the winner is determined, display it above the squares.

Killara Quokkas is the Winner.

■ ■ ■ ■ ■ ■ ■

Constraints

You may:

  • Develop only for Chrome
  • Use any feature available in the latest stable release of Chrome
  • Edit /etc/hosts

You must not:

  • Hard code the number of teams per match — respect the #teamsPerMatch value
  • Modify the server or integration tests
  • Modify/remove the #teamsPerMatch, #numberOfTeams, #start, or #winner elements
  • Submit your solution if the test suite is failing
  • Use any build tools other than npm (Browserify, webpack, etc.)
  • Use any frameworks or libraries (Angular, jQuery, React, etc.)

Marking Criteria

Your code should be clear and easy to understand:

  • Avoids unnecessary complexity / over-engineering
  • Brief comments are added where appropriate
  • Broken into logical chunks
  • Follows a module pattern

Your code should be performant:

  • Gives feedback to the user as soon as possible (perceived performance)
  • Intelligently coordinates dependent asynchronous tasks
  • UI remains responsive

Your code should be testable (but writing tests isn't necessary):

  • Application and bootstrap code is split into separate files
  • Class-based architecture (ES6 classes preferred)
  • Dependency injection (the design pattern, not a framework or library)
  • No singletons or static mutable state

Running

// Node v6+ required
npm install
npm start # Starts the server on port 8765
npm test # Runs the test suite

Server API

GET /

Serves index.html.

GET /client/*

Serves resources from the client directory.

GET /shared/*

Serves resources from the shared directory.

POST /tournament

Creates a tournament and gets the first round's matches.

Parameters

Name Type Description
numberOfTeams number Number of teams in the tournament you want to create
teamsPerMatch number Number of teams per match 
$ curl -d numberOfTeams=4&teamsPerMatch=2 http://localhost:8765/tournament
{
  tournamentId: 0,
  matchUps: [{
    match: 0,
    teamIds: [0, 1]
  }, {
    match: 1,
    teamIds: [2, 3]
  }]
}

GET /team

Gets team data.

Query Parameters

Name Type Description
tournamentId number TournamentID
teamId number Team ID 
$ curl http://localhost:8765/team?tournamentId=0&teamId=0
{
  teamId: 0,
  name: "Camden Wombats",
  score: 8
}

GET /match

Gets match data.

Query Parameters

Name Type Description
tournamentId number Tournament ID
round number Round of the tournament (0-indexed)
match number Match of the round (0-indexed) 
$ curl http://localhost:8765/match?tournamentId=0&round=0&match=0
{
  score: 67
}

GET /winner

Gets the winning score of a match.

Query Parameters

Name Type Description
tournamentId number Tournament ID
teamScores Array<number> Team scores
matchScore number Score for the match being played 
$ curl http://localhost:8765/winner?tournamentId=0&teamScores=8&teamScores=9&matchScore=67
{
  score: 9
}