D3 Examples - Bar Chart

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<html lang = "en">
    <head>
        <meta charset = "utf-8">
        <title>Bar Chart</title>
        <script src="https://d3js.org/d3.v5.min.js"></script>
    </head>
    
    <body>
        <script type = "text/javascript">
        
        //width and height
        var w = 600;
        var h = 400;
        var padding = 15;
        var numBars = 5;
        
        var states = ["Alabama","Alaska","Arizona","Arkansas","California"];
        /*
        var dataset;
        //load data
        d3.csv('weather.csv', function(d) {
            //data.forEach(function(d) {
            //dataset.push(d.precipitation);
            return {
                //max: d.Maximum,
                //min: d.Minimum,
                //month: d.Month,
                precipitation: d.Precipitation
                //speed: d.Speed,
                //state: d.State,
                //year: d.Year
            };
        }, function(d) {
            dataset.push(d.precipitation); 
        });
        
        
        
        var temp;
        var string;
        for(var i = 0; i < numBars; i++) {
            string = dataset.get(i);
            state = states.get(i);
            temp = {state: string};
            dataset.push(temp);
        }*/
        
        //var dataset = data.slice(0, numBars + 1);
        dataset = [{state: "Alabama", value: 164.6},
                    {state: "Alaska", value: 973.2},
                    {state: "Arizona", value: 43.1},
                    {state: "Arkansas", value: 96},
                    {state: "California", value: 323.5}];
        
        //scale function
        var xScale = d3.scaleBand()
            //.domain(["Alabama","Alaska","Arizona","Arkansas","California"])
            .domain(d3.range(dataset.length))
            //.range([padding, w-padding * 2]);
            .rangeRound([0, w])
            .paddingInner(0.05);
            
        var yScale = d3.scaleLinear()
            .domain([0, d3.max(dataset, function(d) { return d.value; })])
            //.range([padding, w-padding * 2]);
            .range([0, h - padding]);
        
        //create svg element
        var svg = d3.select("body")
                    .append("svg")
                    .attr("width", w)
                    .attr("height", h);
                    
        svg.selectAll("rect")
            .data(dataset)
            .enter()
            .append("rect")
            .attr("x", function(d, i) {
                return xScale(i);
            })
            .attr("y", function(d) {
                return h - yScale(d.value);
            })
            .attr("width", xScale.bandwidth())
            .attr("height", function(d) {
                return yScale(d.value);
            })
            .attr("fill", function(d) {
                return "rgb(0, " + (d.value * 0.5) + ", 50)";
            });
            
        svg.selectAll("text")
            .data(dataset)
            .enter()
            .append("text")
            .text(function(d) {
                return d.value;
            })
            .attr("text-anchor", "middle")
            .attr("x", function(d, i) {
                return xScale(i) + padding;//, + xScale.bandwidth() / 2;
            })
            .attr("y", function(d) {
                return h - yScale(d.value) + padding;
            })
            .attr("font-family", "sans-serif")
            .attr("font-size", "11px")
            .attr("fill", "white");
        
        </script>
    </body>
</html>
    