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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
​
</body>
</html>
 
var dealers = [{
  "id": 1874,
    "critiquesAvg": 0 ,
    "critiques":[
        {
            'author': 'John Does',
            'comment': "I like it",
            'stars' : 5
        },
        {
            'author': 'Jacob Works',
            'comment': "I like it too",
            'stars' : 4.5
        }
    ]
},
{
    "id": 1345,
    "critiquesAvg": 5 ,
    "critiques":[
        {
            'author': 'John Does',
            'comment': "I like it",
            'stars' : 5
        },
        {
            'author': 'Jacob Works',
            'comment': "I like it too",
            'stars' : 5
        }
    ]
}
];
​
var Dealers = {
    calculate: function(dealer){
        var sum = dealer.critiques.reduce(function(x, y) {
            return x.stars + y.stars; 
        });
        var average = sum / dealer.critiques.length;
        return average;
    },
    gen: function(dealers){
        for(i=0;i<dealers.length;i++){
            dealers[i].critiquesAvg = this.calculate(dealers[i]);
        }
​
        return dealers;
    }
};
​
dealers = Dealers.gen(dealers);
​
dealers.push({
    "id": 1346,
    "critiquesAvg": 0 ,
    "critiques":[
        {
            'author': 'John Does',
            'comment': "I like it",
            'stars' : 5
        },
        {
            'author': 'Jacob Works',
            'comment': "I like it too",
            'stars' : 5
        }
    ]
});
​
dealers = Dealers.gen(dealers);
console.log(dealers);
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