var numbers = [];
var context = document.getElementById("chart");
var config = {
  type: 'doughnut',
  data: {
    datasets: [
       {
       backgroundColor: ['orange', 'blue', 'yellow'],
       data: numbers,
       borderWidth: 0,
       }
    ]
  },
  options: {
       responsive: false,
  }
}
var chart = new Chart(context, config);

const socket = io();

var someValue = 7;

socket.emit('add', someValue);

socket.on('update', (arr) => {
    numbers = arr;
    console.log(numbers);
});

const chartArray = [];

io.on('connection', (socket) => {
    socket.on('add', (data) => {
        chartArray.push(data);
    });

    setInterval(function() {
        socket.emit('update', chartArray);
    },1000/25);
});