basic reusable bar chart

<!DOCTYPE html>
<html> 
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.js"></script>
<style>
  svg {
    border: 1px dotted red;
  }
</style>
</head>
<body>
<div id="runningHistory"></div>
<div id="viz2"></div>
</body>
  <script>
    var milesRun = [2, 5, 4, 1, 2, 6, 5];
    var highTemperatures = [77, 71, 82, 87, 84, 78, 80, 84, 86, 72, 71, 68, 75, 73, 80, 85, 86, 80];
    
    
 		function drawChart(dom, data, options) {
      const width = options.width || 500;
      const height = options.height || 300;
      const barPadding = options.barPadding || 1;
    	const fillColor = options.fillColor || 'steelblue';
 
    	var barSpacing = height / data.length;
    	var barHeight = barSpacing - barPadding;
    	var maxValue = d3.max(data);
    	var widthScale = width / maxValue;
      
      d3.select(dom).append('svg')
      	.attr('width', width)
      	.attr('height', height)
      	.selectAll('rect')
      	.data(data)
      	.enter()
        .append('rect')
        .attr('y', (d,i) => i * barSpacing)
        .attr('height', barHeight)
        .attr('x', 0)
        .attr('width', d => d*widthScale)
        .attr('fill', fillColor);
    }
    
   var runningOptions = {barPadding: 2, fillColor: 'coral'};
    drawChart('#runningHistory', milesRun, runningOptions);
    
   const weaOps = {barPadding: 10, fillColor: 'pink',
                  width: 200}
   drawChart('#viz2', highTemperatures, weaOps)
    
    
  </script>
</html>

https://d3js.org/d3.v4.js