Separate players into two teams based on their ratings using AngularJS / JavaScript

Question

Separate players into two teams based on their ratings using AngularJS / JavaScript

In my possession are an array of players along with their names and ratings.

$scope.players = [
  {"name": "Qasim", "rating": "10"}, 
  {"name": "Mahsam", "rating": 10}, 
  {"name": "Aj", "rating": 3}, 
  {"name": "Osman", "rating": 7}, 
  {"name": "Usama", "rating": 7}, 
  {"name": "Bilal", "rating": 3}
]

The task at hand is to categorize players into two teams based on their ratings.

var playerLength = $scope.players.length,
grouped = _.groupBy($scope.players,function(item){return item.rating});

The objective is to form two balanced teams with equal ratings.

javascript angularjs algorithm

Answer 1

Answer №1

If you're looking for a strategy to allocate players to teams, this solution might be of interest. The approach involves iterating through all the players and assigning each player to the team with the lowest overall strength.

For a more visual representation and better understanding, check out this JSFiddle demonstration.

const myApp = angular.module('myApp', []);
myApp.controller('MyCtrl', ['$scope', function($scope) {
  $scope.players = [{
    "name": "Sarah",
    "rating": 9
  }, {
    "name": "John",
    "rating": 8
  }, {
    "name": "Emily",
    "rating": 4
  }, {
    "name": "Mike",
    "rating": 6
  }, {
    "name": "Laura",
    "rating": 5
  }, {
    "name": "Chris",
    "rating": 3
  }];

  $scope.team1 = [];
  $scope.team2 = [];

  $scope.createTeams = function() {
    angular.forEach($scope.players, function(player) {
      if ($scope.teamStrength($scope.team1) < $scope.teamStrength($scope.team2)) {
        $scope.team1.push(player);
      } else {
        $scope.team2.push(player);
      }
    });
  }

  $scope.teamStrength = function(team) {
    let total = 0;
    if (team.length === 0) return 0;
    for(let i = 0; i < team.length; i++) {
      total += team[i].rating;
    }
    return total;
  };
}]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-app="myApp">
  <div ng-controller="MyCtrl">
    <button ng-click="createTeams()">Create Teams!</button>
    
    <h1>Team 1</h1>
    <div ng-repeat="p in team1">
      {{p.name}} ({{p.rating}})
    </div>
    
    <h1>Team 2</h1>
      <div ng-repeat="p in team2">
    {{p.name}} ({{p.rating}})
    </div>
  </div>
</div>

Answer 2

If you're looking for a strategy to allocate players to teams, this solution might be of interest. The approach involves iterating through all the players and assigning each player to the team with the lowest overall strength.

For a more visual representation and better understanding, check out this JSFiddle demonstration.

const myApp = angular.module('myApp', []);
myApp.controller('MyCtrl', ['$scope', function($scope) {
  $scope.players = [{
    "name": "Sarah",
    "rating": 9
  }, {
    "name": "John",
    "rating": 8
  }, {
    "name": "Emily",
    "rating": 4
  }, {
    "name": "Mike",
    "rating": 6
  }, {
    "name": "Laura",
    "rating": 5
  }, {
    "name": "Chris",
    "rating": 3
  }];

  $scope.team1 = [];
  $scope.team2 = [];

  $scope.createTeams = function() {
    angular.forEach($scope.players, function(player) {
      if ($scope.teamStrength($scope.team1) < $scope.teamStrength($scope.team2)) {
        $scope.team1.push(player);
      } else {
        $scope.team2.push(player);
      }
    });
  }

  $scope.teamStrength = function(team) {
    let total = 0;
    if (team.length === 0) return 0;
    for(let i = 0; i < team.length; i++) {
      total += team[i].rating;
    }
    return total;
  };
}]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<div ng-app="myApp">
  <div ng-controller="MyCtrl">
    <button ng-click="createTeams()">Create Teams!</button>
    
    <h1>Team 1</h1>
    <div ng-repeat="p in team1">
      {{p.name}} ({{p.rating}})
    </div>
    
    <h1>Team 2</h1>
      <div ng-repeat="p in team2">
    {{p.name}} ({{p.rating}})
    </div>
  </div>
</div>

Answer 3

Answer №2

let playersMap = {};
let ratingArr = [];
let teamA = [];
let teamB = [];

for(let id in $scope.players){
    playersMap[$scope.players[id].rating] = $scope.players[id];
    ratingArr.push($scope.players[id].rating);
}
ratingArr.sort();
for(let i = 0; i < ratingArr.length; i+=2) {
    teamA.push({name: playersMap[ratingArr[i]].name, rating: playersMap[ratingArr[i]].rating});
}
for(let i = 1; i < ratingArr.length; i+=2){ 
    teamB.push({name: playersMap[ratingArr[i]].name, rating: playersMap[ratingArr[i]].rating});
}

Answer 4

let playersMap = {};
let ratingArr = [];
let teamA = [];
let teamB = [];

for(let id in $scope.players){
    playersMap[$scope.players[id].rating] = $scope.players[id];
    ratingArr.push($scope.players[id].rating);
}
ratingArr.sort();
for(let i = 0; i < ratingArr.length; i+=2) {
    teamA.push({name: playersMap[ratingArr[i]].name, rating: playersMap[ratingArr[i]].rating});
}
for(let i = 1; i < ratingArr.length; i+=2){ 
    teamB.push({name: playersMap[ratingArr[i]].name, rating: playersMap[ratingArr[i]].rating});
}

Answer 5

Answer №3

One possible approach:

Note: Adjustments have been made to align with the query.

var soccerPlayers = [
  {"name": "David", "rating": "10"}, 
  {"name": "Luis", "rating": 10}, 
  {"name": "John", "rating": 3}, 
  {"name": "Roberto", "rating": 7}, 
  {"name": "Carlos", "rating": 7}, 
  {"name": "Michael", "rating": 3}
];

soccerPlayers.sort(function(a, b){
    return a.rating - b.rating
});

console.log(soccerPlayers); //sorted

var teamA = [], teamB = [];

//In this scenario, each player has the same rating twice
for (let index=0;index<soccerPlayers.length;index += 2) {
    teamA.push(soccerPlayers[index]);
    teamB.push(soccerPlayers[index+1]);
}
console.log(teamA, teamB);

:)

Answer 6

One possible approach:

Note: Adjustments have been made to align with the query.

var soccerPlayers = [
  {"name": "David", "rating": "10"}, 
  {"name": "Luis", "rating": 10}, 
  {"name": "John", "rating": 3}, 
  {"name": "Roberto", "rating": 7}, 
  {"name": "Carlos", "rating": 7}, 
  {"name": "Michael", "rating": 3}
];

soccerPlayers.sort(function(a, b){
    return a.rating - b.rating
});

console.log(soccerPlayers); //sorted

var teamA = [], teamB = [];

//In this scenario, each player has the same rating twice
for (let index=0;index<soccerPlayers.length;index += 2) {
    teamA.push(soccerPlayers[index]);
    teamB.push(soccerPlayers[index+1]);
}
console.log(teamA, teamB);

:)

Separate players into two teams based on their ratings using AngularJS / JavaScript

Answer №1

Answer №2

Answer №3

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