Generate random numbers for d3 barchart

d3randombarchart

var dataset = [];
	for (var i = 0; i < 25; i++) {		//Loop 25 times
	var newNumber = Math.round(Math.random() * 30);	//New random number (0-30)
	dataset = dataset.concat(newNumber);	//Add new number to array
}

d3.select("body").selectAll("div")
	.data(dataset)
	.enter()
	.append("div")
	.attr("class", "bar")
	.style("height", function(d) {
		var barHeight = d * 5;
		return barHeight + "px";
});