JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://rawgit.com/nnnick/Chart.js/v1.0.2/Chart.min.js"></script>
<canvas id="myChart" width="400" height="200"></canvas>

JavaScript

function generateData() {
    yArr = [Math.random() * 100];
}

var data = {
    labels: ["J", "F", "M", "A", "M", "J", "J"],
    datasets: [
        {
            label: "My First dataset",
            fillColor: "rgba(220,220,0,0.5)",
            strokeColor: "rgba(220,220,0,0.8)",
            highlightFill: "rgba(220,220,0,0.75)",
            highlightStroke: "rgba(220,220,0,1)",
            data: [65, 59, 80, 81, 56, 55, 40]
        }
    ]
};

var ctx = document.getElementById("myChart").getContext("2d");
var myLineChart = new Chart(ctx).Line(data);

//simDur is the duration i want the simulation to run for eg 1hr/3600secs
var simDur = 10;
var yArr;

var t = 0;
var interval = setInterval(function () {
    if (t >= simDur) {
        clearInterval(interval);
        return;
    }
    
    generateData(); //calculate the new data yArr;
    myLineChart.addData(yArr, t); //yArr is an array of Y values, t=time
    myLineChart.update();  //update the chart with the new added data
    
    t++;
}, 1000)