let data = {
  labels: ["12am-3am", "3am-6am", "6am-9am", "9am-12pm",
    "12pm-3pm", "3pm-6pm", "6pm-9pm", "9pm-12am"],

  datasets: [
    {
      title: "Some Data", color: "light-blue",
      values: [25, 40, 30, 35, 8, 52, 17, -4]
    },
    {
      title: "Another Set", color: "violet",
      values: [25, 50, -10, 15, 18, 32, 27, 14]
    }
  ]
};

let chart = new Chart({
  parent: "#chart",
  title: "My Awesome Chart",
  data: data,
  type: 'bar', // or 'line', 'scatter', 'percentage'
  height: 250
});