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<!DOCTYPE html>
<html>
<head>
  <script>
     var gameController = {
                scores  :[20, 34, 55, 46, 77],
                avgScore:null,
                players :[
                    {name:"Tomy", playerID:987, age:23},
                    {name:"Pau", playerID:87, age:33}
                ]
            }
​
            var appController = {
                scores  :[900, 845, 809, 950],
                avgScore:null,
                avg     :function () {
​
                    var sumOfScores = this.scores.reduce (function (prev, cur, index, array) {
                        return prev + cur;
                    });
​
                    this.avgScore = sumOfScores / this.scores.length;
                }
            }
​
            //If we run the code below,
            // the gameController.avgScore property will be set to the average score from the appController object scores array
            // The avg method "this" keyword will not refer to the gameController object, it will refer to the appController object because it is being invoked on appController
            // Don't run this code, we want the appController.avgScore to remain null
            
            appController.avg.apply (gameController, gameController.scores);
​
            // The avgScore property was successfully set on the gameController object, even though we borrowed the avg () method from the appController object
            console.log (gameController.avgScore); // 46.4
    
    console.log (appController.avgScore); 
  </script>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  
</body>
</html>
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jsissexypro
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