example-3-1.js

function getData() {

	var data = [];

	var metrics =
	{
	    "countries":
	    [
	        {
	            "country": "USA",
	            "metrics":
	            [
	                {
	                    "date" : "2012-08-19",
	                    "DAU" : 500,
	                    "DNU" : 200,
	                    "sessions" : 100,
	                    "sessions_length" : 2000,
	                    "d1_retention" : 102,
	                    "d7_retention" : 48,
	                    "d30_retention" : 16
	                },
	                {
	                    "date" : "2012-08-20",
	                    "DAU" : 800,
	                    "DNU" : 300,
	                    "sessions" : 120,
	                    "sessions_length" : 4000,
	                    "d1_retention" : 82,
	                    "d7_retention" : 58,
	                    "d30_retention" : 19
	                },
	                {
	                    "date" : "2012-08-21",
	                    "DAU" : 1000,
	                    "DNU" : 700,
	                    "sessions" : 200,
	                    "sessions_length" : 5000,
	                    "d1_retention" : 285,
	                    "d7_retention" : 126,
	                    "d30_retention" : 9
	                }
	            ]
	        },
	        {
				"country": "Estonia",
				"metrics":
				[
					{
						"date" : "2012-08-19",
						"DAU" : 1500,
						"DNU" : 1000,
						"sessions" : 430,
						"sessions_length" : 5100,
						"d1_retention" : 948,
						"d7_retention" : 698,
						"d30_retention" : 294
					},
					{
						"date" : "2012-08-20",
						"DAU" : 2094,
						"DNU" : 1294,
						"sessions" : 491,
						"sessions_length" : 6958,
						"d1_retention" : 1029,
						"d7_retention" : 918,
						"d30_retention" : 485
					},
					{
						"date" : "2012-08-21",
						"DAU" : 2594,
						"DNU" : 1592,
						"sessions" : 592,
						"sessions_length" : 8492,
						"d1_retention" : 1349,
						"d7_retention" : 1029,
						"d30_retention" : 685
					}
				]
			},
			{
				"country": "Finland",
				"metrics":
				[
					{
						"date" : "2012-08-19",
						"DAU" : 984,
						"DNU" : 596,
						"sessions" : 349,
						"sessions_length" : 49852,
						"d1_retention" : 294,
						"d7_retention" : 102,
						"d30_retention" : 55
					},
					{
						"date" : "2012-08-20",
						"DAU" : 890,
						"DNU" : 698,
						"sessions" : 589,
						"sessions_length" : 60921,
						"d1_retention" : 304,
						"d7_retention" : 198,
						"d30_retention" : 78
					},
					{
						"date" : "2012-08-21",
						"DAU" : 1201,
						"DNU" : 509,
						"sessions" : 492,
						"sessions_length" : 70982,
						"d1_retention" : 295,
						"d7_retention" : 159,
						"d30_retention" : 98
					}
				]
			}
		]
	};

	var i = 0;

	$.each(metrics.countries, function() {
		data[i] = [];
		data[i][0] = this.country;

		$.each(this.metrics, function() {
			var metric = this;
			var temp_date = new Date(this.date);
			var month = temp_date.getMonth();
			var date = temp_date.getDate();
			var year = temp_date.getFullYear();
			metric.date = month + '/' + date + '/' + year;
			data[i].push(metric);
		});
		i++;
	});

	return data;

}